21455915

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{97}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 29042496

約数和(自身を除く): 7586581

約数列:

[1, 5, 13, 41, 65, 83, 97, 205, 415, 485, 533, 1079, 1261, 2665, 3403, 3977, 5395, 6305, 8051, 17015, 19885, 40255, 44239, 51701, 104663, 221195, 258505, 330091, 523315, 1650455, 4291183, 21455915]

約数ペア:

[(1, 21455915), (5, 4291183), (13, 1650455), (41, 523315), (65, 330091), (83, 258505), (97, 221195), (205, 104663), (415, 51701), (485, 44239), (533, 40255), (1079, 19885), (1261, 17015), (2665, 8051), (3403, 6305), (3977, 5395)]