21989680

素因数分解:

$2^4\times 5^1\times {\mathrm{274871}}^1$

素因数の和:274884

約数の個数: 20

約数和(自身を含む): 51126192

約数和(自身を除く): 29136512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 274871, 549742, 1099484, 1374355, 2198968, 2748710, 4397936, 5497420, 10994840, 21989680]

約数ペア:

[(1, 21989680), (2, 10994840), (4, 5497420), (5, 4397936), (8, 2748710), (10, 2198968), (16, 1374355), (20, 1099484), (40, 549742), (80, 274871)]