21138680

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{18223}}^1$

素因数の和:18263

約数の個数: 32

約数和(自身を含む): 49204800

約数和(自身を除く): 28066120

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 145, 232, 290, 580, 1160, 18223, 36446, 72892, 91115, 145784, 182230, 364460, 528467, 728920, 1056934, 2113868, 2642335, 4227736, 5284670, 10569340, 21138680]

約数ペア:

[(1, 21138680), (2, 10569340), (4, 5284670), (5, 4227736), (8, 2642335), (10, 2113868), (20, 1056934), (29, 728920), (40, 528467), (58, 364460), (116, 182230), (145, 145784), (232, 91115), (290, 72892), (580, 36446), (1160, 18223)]