21389179

素因数分解:

$7^1\times {\mathrm{17}}^2\times {\mathrm{97}}^1\times {\mathrm{109}}^1$

素因数の和:247

約数の個数: 24

約数和(自身を含む): 26475680

約数和(自身を除く): 5086501

約数列:

[1, 7, 17, 97, 109, 119, 289, 679, 763, 1649, 1853, 2023, 10573, 11543, 12971, 28033, 31501, 74011, 179741, 196231, 220507, 1258187, 3055597, 21389179]

約数ペア:

[(1, 21389179), (7, 3055597), (17, 1258187), (97, 220507), (109, 196231), (119, 179741), (289, 74011), (679, 31501), (763, 28033), (1649, 12971), (1853, 11543), (2023, 10573)]