19988800

素因数分解:

$2^6\times 5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^2$

素因数の和:97

約数の個数: 126

約数和(自身を含む): 54732174

約数和(自身を除く): 34743374

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 31, 32, 40, 50, 52, 62, 64, 65, 80, 100, 104, 124, 130, 155, 160, 200, 208, 248, 260, 310, 320, 325, 400, 403, 416, 496, 520, 620, 650, 775, 800, 806, 832, 961, 992, 1040, 1240, 1300, 1550, 1600, 1612, 1922, 1984, 2015, 2080, 2480, 2600, 3100, 3224, 3844, 4030, 4160, 4805, 4960, 5200, 6200, 6448, 7688, 8060, 9610, 9920, 10075, 10400, 12400, 12493, 12896, 15376, 16120, 19220, 20150, 20800, 24025, 24800, 24986, 25792, 30752, 32240, 38440, 40300, 48050, 49600, 49972, 61504, 62465, 64480, 76880, 80600, 96100, 99944, 124930, 128960, 153760, 161200, 192200, 199888, 249860, 307520, 312325, 322400, 384400, 399776, 499720, 624650, 644800, 768800, 799552, 999440, 1249300, 1537600, 1998880, 2498600, 3997760, 4997200, 9994400, 19988800]

約数ペア:

[(1, 19988800), (2, 9994400), (4, 4997200), (5, 3997760), (8, 2498600), (10, 1998880), (13, 1537600), (16, 1249300), (20, 999440), (25, 799552), (26, 768800), (31, 644800), (32, 624650), (40, 499720), (50, 399776), (52, 384400), (62, 322400), (64, 312325), (65, 307520), (80, 249860), (100, 199888), (104, 192200), (124, 161200), (130, 153760), (155, 128960), (160, 124930), (200, 99944), (208, 96100), (248, 80600), (260, 76880), (310, 64480), (320, 62465), (325, 61504), (400, 49972), (403, 49600), (416, 48050), (496, 40300), (520, 38440), (620, 32240), (650, 30752), (775, 25792), (800, 24986), (806, 24800), (832, 24025), (961, 20800), (992, 20150), (1040, 19220), (1240, 16120), (1300, 15376), (1550, 12896), (1600, 12493), (1612, 12400), (1922, 10400), (1984, 10075), (2015, 9920), (2080, 9610), (2480, 8060), (2600, 7688), (3100, 6448), (3224, 6200), (3844, 5200), (4030, 4960), (4160, 4805)]