21590261

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{73}}^1\times {\mathrm{167}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 28643328

約数和(自身を除く): 7053067

約数列:

[1, 7, 11, 23, 73, 77, 161, 167, 253, 511, 803, 1169, 1679, 1771, 1837, 3841, 5621, 11753, 12191, 12859, 18469, 26887, 42251, 85337, 129283, 134101, 280393, 295757, 938707, 1962751, 3084323, 21590261]

約数ペア:

[(1, 21590261), (7, 3084323), (11, 1962751), (23, 938707), (73, 295757), (77, 280393), (161, 134101), (167, 129283), (253, 85337), (511, 42251), (803, 26887), (1169, 18469), (1679, 12859), (1771, 12191), (1837, 11753), (3841, 5621)]