21516560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1217}}^1$

素因数の和:1260

約数の個数: 80

約数和(自身を含む): 57090096

約数和(自身を除く): 35573536

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 26, 34, 40, 52, 65, 68, 80, 85, 104, 130, 136, 170, 208, 221, 260, 272, 340, 442, 520, 680, 884, 1040, 1105, 1217, 1360, 1768, 2210, 2434, 3536, 4420, 4868, 6085, 8840, 9736, 12170, 15821, 17680, 19472, 20689, 24340, 31642, 41378, 48680, 63284, 79105, 82756, 97360, 103445, 126568, 158210, 165512, 206890, 253136, 268957, 316420, 331024, 413780, 537914, 632840, 827560, 1075828, 1265680, 1344785, 1655120, 2151656, 2689570, 4303312, 5379140, 10758280, 21516560]

約数ペア:

[(1, 21516560), (2, 10758280), (4, 5379140), (5, 4303312), (8, 2689570), (10, 2151656), (13, 1655120), (16, 1344785), (17, 1265680), (20, 1075828), (26, 827560), (34, 632840), (40, 537914), (52, 413780), (65, 331024), (68, 316420), (80, 268957), (85, 253136), (104, 206890), (130, 165512), (136, 158210), (170, 126568), (208, 103445), (221, 97360), (260, 82756), (272, 79105), (340, 63284), (442, 48680), (520, 41378), (680, 31642), (884, 24340), (1040, 20689), (1105, 19472), (1217, 17680), (1360, 15821), (1768, 12170), (2210, 9736), (2434, 8840), (3536, 6085), (4420, 4868)]