21315879

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{653}}^1$

素因数の和:709

約数の個数: 40

約数和(自身を含む): 35452032

約数和(自身を除く): 14136153

約数列:

[1, 3, 9, 13, 27, 31, 39, 81, 93, 117, 279, 351, 403, 653, 837, 1053, 1209, 1959, 2511, 3627, 5877, 8489, 10881, 17631, 20243, 25467, 32643, 52893, 60729, 76401, 182187, 229203, 263159, 546561, 687609, 789477, 1639683, 2368431, 7105293, 21315879]

約数ペア:

[(1, 21315879), (3, 7105293), (9, 2368431), (13, 1639683), (27, 789477), (31, 687609), (39, 546561), (81, 263159), (93, 229203), (117, 182187), (279, 76401), (351, 60729), (403, 52893), (653, 32643), (837, 25467), (1053, 20243), (1209, 17631), (1959, 10881), (2511, 8489), (3627, 5877)]