20990138

素因数分解:

$2^1\times {\mathrm{13}}^3\times {\mathrm{17}}^1\times {\mathrm{281}}^1$

素因数の和:339

約数の個数: 32

約数和(自身を含む): 36242640

約数和(自身を除く): 15252502

約数列:

[1, 2, 13, 17, 26, 34, 169, 221, 281, 338, 442, 562, 2197, 2873, 3653, 4394, 4777, 5746, 7306, 9554, 37349, 47489, 62101, 74698, 94978, 124202, 617357, 807313, 1234714, 1614626, 10495069, 20990138]

約数ペア:

[(1, 20990138), (2, 10495069), (13, 1614626), (17, 1234714), (26, 807313), (34, 617357), (169, 124202), (221, 94978), (281, 74698), (338, 62101), (442, 47489), (562, 37349), (2197, 9554), (2873, 7306), (3653, 5746), (4394, 4777)]