21493731

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{103}}^1\times {\mathrm{523}}^1$

素因数の和:655

約数の個数: 32

約数和(自身を含む): 34877440

約数和(自身を除く): 13383709

約数列:

[1, 3, 7, 19, 21, 57, 103, 133, 309, 399, 523, 721, 1569, 1957, 2163, 3661, 5871, 9937, 10983, 13699, 29811, 41097, 53869, 69559, 161607, 208677, 377083, 1023511, 1131249, 3070533, 7164577, 21493731]

約数ペア:

[(1, 21493731), (3, 7164577), (7, 3070533), (19, 1131249), (21, 1023511), (57, 377083), (103, 208677), (133, 161607), (309, 69559), (399, 53869), (523, 41097), (721, 29811), (1569, 13699), (1957, 10983), (2163, 9937), (3661, 5871)]