640900400

素因数分解:

$2^4\times 5^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{1721}}^1$

素因数の和:1772

約数の個数: 180

約数和(自身を含む): 1886519880

約数和(自身を除く): 1245619480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 19, 20, 25, 28, 35, 38, 40, 49, 50, 56, 70, 76, 80, 95, 98, 100, 112, 133, 140, 152, 175, 190, 196, 200, 245, 266, 280, 304, 350, 380, 392, 400, 475, 490, 532, 560, 665, 700, 760, 784, 931, 950, 980, 1064, 1225, 1330, 1400, 1520, 1721, 1862, 1900, 1960, 2128, 2450, 2660, 2800, 3325, 3442, 3724, 3800, 3920, 4655, 4900, 5320, 6650, 6884, 7448, 7600, 8605, 9310, 9800, 10640, 12047, 13300, 13768, 14896, 17210, 18620, 19600, 23275, 24094, 26600, 27536, 32699, 34420, 37240, 43025, 46550, 48188, 53200, 60235, 65398, 68840, 74480, 84329, 86050, 93100, 96376, 120470, 130796, 137680, 163495, 168658, 172100, 186200, 192752, 228893, 240940, 261592, 301175, 326990, 337316, 344200, 372400, 421645, 457786, 481880, 523184, 602350, 653980, 674632, 688400, 817475, 843290, 915572, 963760, 1144465, 1204700, 1307960, 1349264, 1602251, 1634950, 1686580, 1831144, 2108225, 2288930, 2409400, 2615920, 3204502, 3269900, 3373160, 3662288, 4216450, 4577860, 4818800, 5722325, 6409004, 6539800, 6746320, 8011255, 8432900, 9155720, 11444650, 12818008, 13079600, 16022510, 16865800, 18311440, 22889300, 25636016, 32045020, 33731600, 40056275, 45778600, 64090040, 80112550, 91557200, 128180080, 160225100, 320450200, 640900400]

約数ペア:

[(1, 640900400), (2, 320450200), (4, 160225100), (5, 128180080), (7, 91557200), (8, 80112550), (10, 64090040), (14, 45778600), (16, 40056275), (19, 33731600), (20, 32045020), (25, 25636016), (28, 22889300), (35, 18311440), (38, 16865800), (40, 16022510), (49, 13079600), (50, 12818008), (56, 11444650), (70, 9155720), (76, 8432900), (80, 8011255), (95, 6746320), (98, 6539800), (100, 6409004), (112, 5722325), (133, 4818800), (140, 4577860), (152, 4216450), (175, 3662288), (190, 3373160), (196, 3269900), (200, 3204502), (245, 2615920), (266, 2409400), (280, 2288930), (304, 2108225), (350, 1831144), (380, 1686580), (392, 1634950), (400, 1602251), (475, 1349264), (490, 1307960), (532, 1204700), (560, 1144465), (665, 963760), (700, 915572), (760, 843290), (784, 817475), (931, 688400), (950, 674632), (980, 653980), (1064, 602350), (1225, 523184), (1330, 481880), (1400, 457786), (1520, 421645), (1721, 372400), (1862, 344200), (1900, 337316), (1960, 326990), (2128, 301175), (2450, 261592), (2660, 240940), (2800, 228893), (3325, 192752), (3442, 186200), (3724, 172100), (3800, 168658), (3920, 163495), (4655, 137680), (4900, 130796), (5320, 120470), (6650, 96376), (6884, 93100), (7448, 86050), (7600, 84329), (8605, 74480), (9310, 68840), (9800, 65398), (10640, 60235), (12047, 53200), (13300, 48188), (13768, 46550), (14896, 43025), (17210, 37240), (18620, 34420), (19600, 32699), (23275, 27536), (24094, 26600)]