21205640

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{5147}}^1$

素因数の和:5261

約数の個数: 32

約数和(自身を含む): 48185280

約数和(自身を除く): 26979640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 5147, 10294, 20588, 25735, 41176, 51470, 102940, 205880, 530141, 1060282, 2120564, 2650705, 4241128, 5301410, 10602820, 21205640]

約数ペア:

[(1, 21205640), (2, 10602820), (4, 5301410), (5, 4241128), (8, 2650705), (10, 2120564), (20, 1060282), (40, 530141), (103, 205880), (206, 102940), (412, 51470), (515, 41176), (824, 25735), (1030, 20588), (2060, 10294), (4120, 5147)]