21557571

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{97}}^1\times {\mathrm{557}}^1$

素因数の和:683

約数の個数: 32

約数和(自身を含む): 34997760

約数和(自身を除く): 13440189

約数列:

[1, 3, 7, 19, 21, 57, 97, 133, 291, 399, 557, 679, 1671, 1843, 2037, 3899, 5529, 10583, 11697, 12901, 31749, 38703, 54029, 74081, 162087, 222243, 378203, 1026551, 1134609, 3079653, 7185857, 21557571]

約数ペア:

[(1, 21557571), (3, 7185857), (7, 3079653), (19, 1134609), (21, 1026551), (57, 378203), (97, 222243), (133, 162087), (291, 74081), (399, 54029), (557, 38703), (679, 31749), (1671, 12901), (1843, 11697), (2037, 10583), (3899, 5529)]