21782180

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{991}}^1$

素因数の和:1164

約数の個数: 48

約数和(自身を含む): 52663296

約数和(自身を除く): 30881116

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 991, 1099, 1570, 1982, 2198, 3140, 3964, 4396, 4955, 5495, 6937, 9910, 10990, 13874, 19820, 21980, 27748, 34685, 69370, 138740, 155587, 311174, 622348, 777935, 1089109, 1555870, 2178218, 3111740, 4356436, 5445545, 10891090, 21782180]

約数ペア:

[(1, 21782180), (2, 10891090), (4, 5445545), (5, 4356436), (7, 3111740), (10, 2178218), (14, 1555870), (20, 1089109), (28, 777935), (35, 622348), (70, 311174), (140, 155587), (157, 138740), (314, 69370), (628, 34685), (785, 27748), (991, 21980), (1099, 19820), (1570, 13874), (1982, 10990), (2198, 9910), (3140, 6937), (3964, 5495), (4396, 4955)]