21318940

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1\times {\mathrm{131}}^1$

素因数の和:322

約数の個数: 48

約数和(自身を含む): 46126080

約数和(自身を除く): 24807140

約数列:

[1, 2, 4, 5, 10, 20, 79, 103, 131, 158, 206, 262, 316, 395, 412, 515, 524, 655, 790, 1030, 1310, 1580, 2060, 2620, 8137, 10349, 13493, 16274, 20698, 26986, 32548, 40685, 41396, 51745, 53972, 67465, 81370, 103490, 134930, 162740, 206980, 269860, 1065947, 2131894, 4263788, 5329735, 10659470, 21318940]

約数ペア:

[(1, 21318940), (2, 10659470), (4, 5329735), (5, 4263788), (10, 2131894), (20, 1065947), (79, 269860), (103, 206980), (131, 162740), (158, 134930), (206, 103490), (262, 81370), (316, 67465), (395, 53972), (412, 51745), (515, 41396), (524, 40685), (655, 32548), (790, 26986), (1030, 20698), (1310, 16274), (1580, 13493), (2060, 10349), (2620, 8137)]