21009740

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{6691}}^1$

素因数の和:6857

約数の個数: 24

約数和(自身を含む): 44408112

約数和(自身を除く): 23398372

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 6691, 13382, 26764, 33455, 66910, 133820, 1050487, 2100974, 4201948, 5252435, 10504870, 21009740]

約数ペア:

[(1, 21009740), (2, 10504870), (4, 5252435), (5, 4201948), (10, 2100974), (20, 1050487), (157, 133820), (314, 66910), (628, 33455), (785, 26764), (1570, 13382), (3140, 6691)]