20917640

素因数分解:

$2^3\times 5^1\times {\mathrm{281}}^1\times {\mathrm{1861}}^1$

素因数の和:2153

約数の個数: 32

約数和(自身を含む): 47257560

約数和(自身を除く): 26339920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 281, 562, 1124, 1405, 1861, 2248, 2810, 3722, 5620, 7444, 9305, 11240, 14888, 18610, 37220, 74440, 522941, 1045882, 2091764, 2614705, 4183528, 5229410, 10458820, 20917640]

約数ペア:

[(1, 20917640), (2, 10458820), (4, 5229410), (5, 4183528), (8, 2614705), (10, 2091764), (20, 1045882), (40, 522941), (281, 74440), (562, 37220), (1124, 18610), (1405, 14888), (1861, 11240), (2248, 9305), (2810, 7444), (3722, 5620)]