21581960

素因数分解:

$2^3\times 5^1\times {\mathrm{709}}^1\times {\mathrm{761}}^1$

素因数の和:1481

約数の個数: 32

約数和(自身を含む): 48691800

約数和(自身を除く): 27109840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 709, 761, 1418, 1522, 2836, 3044, 3545, 3805, 5672, 6088, 7090, 7610, 14180, 15220, 28360, 30440, 539549, 1079098, 2158196, 2697745, 4316392, 5395490, 10790980, 21581960]

約数ペア:

[(1, 21581960), (2, 10790980), (4, 5395490), (5, 4316392), (8, 2697745), (10, 2158196), (20, 1079098), (40, 539549), (709, 30440), (761, 28360), (1418, 15220), (1522, 14180), (2836, 7610), (3044, 7090), (3545, 6088), (3805, 5672)]