20958640

素因数分解:

$2^4\times 5^1\times {\mathrm{261983}}^1$

素因数の和:261996

約数の個数: 20

約数和(自身を含む): 48729024

約数和(自身を除く): 27770384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 261983, 523966, 1047932, 1309915, 2095864, 2619830, 4191728, 5239660, 10479320, 20958640]

約数ペア:

[(1, 20958640), (2, 10479320), (4, 5239660), (5, 4191728), (8, 2619830), (10, 2095864), (16, 1309915), (20, 1047932), (40, 523966), (80, 261983)]