21005540

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61781}}^1$

素因数の和:61807

約数の個数: 24

約数和(自身を含む): 46707192

約数和(自身を除く): 25701652

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 61781, 123562, 247124, 308905, 617810, 1050277, 1235620, 2100554, 4201108, 5251385, 10502770, 21005540]

約数ペア:

[(1, 21005540), (2, 10502770), (4, 5251385), (5, 4201108), (10, 2100554), (17, 1235620), (20, 1050277), (34, 617810), (68, 308905), (85, 247124), (170, 123562), (340, 61781)]