641497960

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{262909}}^1$

素因数の和:262981

約数の個数: 32

約数和(自身を含む): 1467037800

約数和(自身を除く): 825539840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 262909, 525818, 1051636, 1314545, 2103272, 2629090, 5258180, 10516360, 16037449, 32074898, 64149796, 80187245, 128299592, 160374490, 320748980, 641497960]

約数ペア:

[(1, 641497960), (2, 320748980), (4, 160374490), (5, 128299592), (8, 80187245), (10, 64149796), (20, 32074898), (40, 16037449), (61, 10516360), (122, 5258180), (244, 2629090), (305, 2103272), (488, 1314545), (610, 1051636), (1220, 525818), (2440, 262909)]