21870680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{307}}^1$

素因数の和:468

約数の個数: 64

約数和(自身を含む): 53555040

約数和(自身を除く): 31684360

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 137, 260, 274, 307, 520, 548, 614, 685, 1096, 1228, 1370, 1535, 1781, 2456, 2740, 3070, 3562, 3991, 5480, 6140, 7124, 7982, 8905, 12280, 14248, 15964, 17810, 19955, 31928, 35620, 39910, 42059, 71240, 79820, 84118, 159640, 168236, 210295, 336472, 420590, 546767, 841180, 1093534, 1682360, 2187068, 2733835, 4374136, 5467670, 10935340, 21870680]

約数ペア:

[(1, 21870680), (2, 10935340), (4, 5467670), (5, 4374136), (8, 2733835), (10, 2187068), (13, 1682360), (20, 1093534), (26, 841180), (40, 546767), (52, 420590), (65, 336472), (104, 210295), (130, 168236), (137, 159640), (260, 84118), (274, 79820), (307, 71240), (520, 42059), (548, 39910), (614, 35620), (685, 31928), (1096, 19955), (1228, 17810), (1370, 15964), (1535, 14248), (1781, 12280), (2456, 8905), (2740, 7982), (3070, 7124), (3562, 6140), (3991, 5480)]