21284080

素因数分解:

$2^4\times 5^1\times {\mathrm{266051}}^1$

素因数の和:266064

約数の個数: 20

約数和(自身を含む): 49485672

約数和(自身を除く): 28201592

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266051, 532102, 1064204, 1330255, 2128408, 2660510, 4256816, 5321020, 10642040, 21284080]

約数ペア:

[(1, 21284080), (2, 10642040), (4, 5321020), (5, 4256816), (8, 2660510), (10, 2128408), (16, 1330255), (20, 1064204), (40, 532102), (80, 266051)]