21286640

素因数分解:

$2^4\times 5^1\times {\mathrm{266083}}^1$

素因数の和:266096

約数の個数: 20

約数和(自身を含む): 49491624

約数和(自身を除く): 28204984

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266083, 532166, 1064332, 1330415, 2128664, 2660830, 4257328, 5321660, 10643320, 21286640]

約数ペア:

[(1, 21286640), (2, 10643320), (4, 5321660), (5, 4257328), (8, 2660830), (10, 2128664), (16, 1330415), (20, 1064332), (40, 532166), (80, 266083)]