20817771

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{257}}^1$

素因数の和:371

約数の個数: 32

約数和(自身を含む): 31438848

約数和(自身を除く): 10621077

約数列:

[1, 3, 13, 31, 39, 67, 93, 201, 257, 403, 771, 871, 1209, 2077, 2613, 3341, 6231, 7967, 10023, 17219, 23901, 27001, 51657, 81003, 103571, 223847, 310713, 533789, 671541, 1601367, 6939257, 20817771]

約数ペア:

[(1, 20817771), (3, 6939257), (13, 1601367), (31, 671541), (39, 533789), (67, 310713), (93, 223847), (201, 103571), (257, 81003), (403, 51657), (771, 27001), (871, 23901), (1209, 17219), (2077, 10023), (2613, 7967), (3341, 6231)]