21990131505

素因数分解:

$3^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{687299}}^1$

素因数の和:687395

約数の個数: 40

約数和(自身を含む): 39918384000

約数和(自身を除く): 17928252495

約数列:

[1, 3, 5, 9, 15, 27, 45, 79, 81, 135, 237, 395, 405, 711, 1185, 2133, 3555, 6399, 10665, 31995, 687299, 2061897, 3436495, 6185691, 10309485, 18557073, 30928455, 54296621, 55671219, 92785365, 162889863, 271483105, 278356095, 488669589, 814449315, 1466008767, 2443347945, 4398026301, 7330043835, 21990131505]

約数ペア:

[(1, 21990131505), (3, 7330043835), (5, 4398026301), (9, 2443347945), (15, 1466008767), (27, 814449315), (45, 488669589), (79, 278356095), (81, 271483105), (135, 162889863), (237, 92785365), (395, 55671219), (405, 54296621), (711, 30928455), (1185, 18557073), (2133, 10309485), (3555, 6185691), (6399, 3436495), (10665, 2061897), (31995, 687299)]