639998720

素因数分解:

$2^8\times 5^1\times {\mathrm{31}}^1\times {\mathrm{127}}^2$

素因数の和:306

約数の個数: 108

約数和(自身を含む): 1595006784

約数和(自身を除く): 955008064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 127, 128, 155, 160, 248, 254, 256, 310, 320, 496, 508, 620, 635, 640, 992, 1016, 1240, 1270, 1280, 1984, 2032, 2480, 2540, 3937, 3968, 4064, 4960, 5080, 7874, 7936, 8128, 9920, 10160, 15748, 16129, 16256, 19685, 19840, 20320, 31496, 32258, 32512, 39370, 39680, 40640, 62992, 64516, 78740, 80645, 81280, 125984, 129032, 157480, 161290, 162560, 251968, 258064, 314960, 322580, 499999, 503936, 516128, 629920, 645160, 999998, 1007872, 1032256, 1259840, 1290320, 1999996, 2064512, 2499995, 2519680, 2580640, 3999992, 4129024, 4999990, 5039360, 5161280, 7999984, 9999980, 10322560, 15999968, 19999960, 20645120, 31999936, 39999920, 63999872, 79999840, 127999744, 159999680, 319999360, 639998720]

約数ペア:

[(1, 639998720), (2, 319999360), (4, 159999680), (5, 127999744), (8, 79999840), (10, 63999872), (16, 39999920), (20, 31999936), (31, 20645120), (32, 19999960), (40, 15999968), (62, 10322560), (64, 9999980), (80, 7999984), (124, 5161280), (127, 5039360), (128, 4999990), (155, 4129024), (160, 3999992), (248, 2580640), (254, 2519680), (256, 2499995), (310, 2064512), (320, 1999996), (496, 1290320), (508, 1259840), (620, 1032256), (635, 1007872), (640, 999998), (992, 645160), (1016, 629920), (1240, 516128), (1270, 503936), (1280, 499999), (1984, 322580), (2032, 314960), (2480, 258064), (2540, 251968), (3937, 162560), (3968, 161290), (4064, 157480), (4960, 129032), (5080, 125984), (7874, 81280), (7936, 80645), (8128, 78740), (9920, 64516), (10160, 62992), (15748, 40640), (16129, 39680), (16256, 39370), (19685, 32512), (19840, 32258), (20320, 31496)]