21497420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{3571}}^1$

素因数の和:3630

約数の個数: 48

約数和(自身を含む): 52808448

約数和(自身を除く): 31311028

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 70, 86, 140, 172, 215, 301, 430, 602, 860, 1204, 1505, 3010, 3571, 6020, 7142, 14284, 17855, 24997, 35710, 49994, 71420, 99988, 124985, 153553, 249970, 307106, 499940, 614212, 767765, 1074871, 1535530, 2149742, 3071060, 4299484, 5374355, 10748710, 21497420]

約数ペア:

[(1, 21497420), (2, 10748710), (4, 5374355), (5, 4299484), (7, 3071060), (10, 2149742), (14, 1535530), (20, 1074871), (28, 767765), (35, 614212), (43, 499940), (70, 307106), (86, 249970), (140, 153553), (172, 124985), (215, 99988), (301, 71420), (430, 49994), (602, 35710), (860, 24997), (1204, 17855), (1505, 14284), (3010, 7142), (3571, 6020)]