21357915

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{1997}}^1$

素因数の和:2059

約数の個数: 32

約数和(自身を含む): 36827136

約数和(自身を除く): 15469221

約数列:

[1, 3, 5, 15, 23, 31, 69, 93, 115, 155, 345, 465, 713, 1997, 2139, 3565, 5991, 9985, 10695, 29955, 45931, 61907, 137793, 185721, 229655, 309535, 688965, 928605, 1423861, 4271583, 7119305, 21357915]

約数ペア:

[(1, 21357915), (3, 7119305), (5, 4271583), (15, 1423861), (23, 928605), (31, 688965), (69, 309535), (93, 229655), (115, 185721), (155, 137793), (345, 61907), (465, 45931), (713, 29955), (1997, 10695), (2139, 9985), (3565, 5991)]