21720290

素因数分解:

$2^1\times 5^1\times {\mathrm{443}}^1\times {\mathrm{4903}}^1$

素因数の和:5353

約数の個数: 16

約数和(自身を含む): 39192768

約数和(自身を除く): 17472478

約数列:

[1, 2, 5, 10, 443, 886, 2215, 4430, 4903, 9806, 24515, 49030, 2172029, 4344058, 10860145, 21720290]

約数ペア:

[(1, 21720290), (2, 10860145), (5, 4344058), (10, 2172029), (443, 49030), (886, 24515), (2215, 9806), (4430, 4903)]