21216640

素因数分解:

$2^7\times 5^1\times {\mathrm{33151}}^1$

素因数の和:33170

約数の個数: 32

約数和(自身を含む): 50722560

約数和(自身を除く): 29505920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 33151, 66302, 132604, 165755, 265208, 331510, 530416, 663020, 1060832, 1326040, 2121664, 2652080, 4243328, 5304160, 10608320, 21216640]

約数ペア:

[(1, 21216640), (2, 10608320), (4, 5304160), (5, 4243328), (8, 2652080), (10, 2121664), (16, 1326040), (20, 1060832), (32, 663020), (40, 530416), (64, 331510), (80, 265208), (128, 165755), (160, 132604), (320, 66302), (640, 33151)]