81256760

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{307}}^1\times {\mathrm{509}}^1$

素因数の和:840

約数の個数: 64

約数和(自身を含む): 197920800

約数和(自身を除く): 116664040

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 307, 509, 520, 614, 1018, 1228, 1535, 2036, 2456, 2545, 3070, 3991, 4072, 5090, 6140, 6617, 7982, 10180, 12280, 13234, 15964, 19955, 20360, 26468, 31928, 33085, 39910, 52936, 66170, 79820, 132340, 156263, 159640, 264680, 312526, 625052, 781315, 1250104, 1562630, 2031419, 3125260, 4062838, 6250520, 8125676, 10157095, 16251352, 20314190, 40628380, 81256760]

約数ペア:

[(1, 81256760), (2, 40628380), (4, 20314190), (5, 16251352), (8, 10157095), (10, 8125676), (13, 6250520), (20, 4062838), (26, 3125260), (40, 2031419), (52, 1562630), (65, 1250104), (104, 781315), (130, 625052), (260, 312526), (307, 264680), (509, 159640), (520, 156263), (614, 132340), (1018, 79820), (1228, 66170), (1535, 52936), (2036, 39910), (2456, 33085), (2545, 31928), (3070, 26468), (3991, 20360), (4072, 19955), (5090, 15964), (6140, 13234), (6617, 12280), (7982, 10180)]