21915920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1621}}^1$

素因数の和:1660

約数の個数: 60

約数和(自身を含む): 55209636

約数和(自身を除く): 33293716

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1621, 1690, 2704, 3242, 3380, 6484, 6760, 8105, 12968, 13520, 16210, 21073, 25936, 32420, 42146, 64840, 84292, 105365, 129680, 168584, 210730, 273949, 337168, 421460, 547898, 842920, 1095796, 1369745, 1685840, 2191592, 2739490, 4383184, 5478980, 10957960, 21915920]

約数ペア:

[(1, 21915920), (2, 10957960), (4, 5478980), (5, 4383184), (8, 2739490), (10, 2191592), (13, 1685840), (16, 1369745), (20, 1095796), (26, 842920), (40, 547898), (52, 421460), (65, 337168), (80, 273949), (104, 210730), (130, 168584), (169, 129680), (208, 105365), (260, 84292), (338, 64840), (520, 42146), (676, 32420), (845, 25936), (1040, 21073), (1352, 16210), (1621, 13520), (1690, 12968), (2704, 8105), (3242, 6760), (3380, 6484)]