21172720

素因数分解:

$2^4\times 5^1\times {\mathrm{264659}}^1$

素因数の和:264672

約数の個数: 20

約数和(自身を含む): 49226760

約数和(自身を除く): 28054040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264659, 529318, 1058636, 1323295, 2117272, 2646590, 4234544, 5293180, 10586360, 21172720]

約数ペア:

[(1, 21172720), (2, 10586360), (4, 5293180), (5, 4234544), (8, 2646590), (10, 2117272), (16, 1323295), (20, 1058636), (40, 529318), (80, 264659)]