20912840

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{307}}^1$

素因数の和:462

約数の個数: 64

約数和(自身を含む): 51226560

約数和(自身を除く): 30313720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 131, 260, 262, 307, 520, 524, 614, 655, 1048, 1228, 1310, 1535, 1703, 2456, 2620, 3070, 3406, 3991, 5240, 6140, 6812, 7982, 8515, 12280, 13624, 15964, 17030, 19955, 31928, 34060, 39910, 40217, 68120, 79820, 80434, 159640, 160868, 201085, 321736, 402170, 522821, 804340, 1045642, 1608680, 2091284, 2614105, 4182568, 5228210, 10456420, 20912840]

約数ペア:

[(1, 20912840), (2, 10456420), (4, 5228210), (5, 4182568), (8, 2614105), (10, 2091284), (13, 1608680), (20, 1045642), (26, 804340), (40, 522821), (52, 402170), (65, 321736), (104, 201085), (130, 160868), (131, 159640), (260, 80434), (262, 79820), (307, 68120), (520, 40217), (524, 39910), (614, 34060), (655, 31928), (1048, 19955), (1228, 17030), (1310, 15964), (1535, 13624), (1703, 12280), (2456, 8515), (2620, 7982), (3070, 6812), (3406, 6140), (3991, 5240)]