20905625

素因数分解:

$5^4\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1$

素因数の和:147

約数の個数: 40

約数和(自身を含む): 29390592

約数和(自身を除く): 8484967

約数列:

[1, 5, 13, 25, 31, 65, 83, 125, 155, 325, 403, 415, 625, 775, 1079, 1625, 2015, 2075, 2573, 3875, 5395, 8125, 10075, 10375, 12865, 19375, 26975, 33449, 50375, 51875, 64325, 134875, 167245, 251875, 321625, 674375, 836225, 1608125, 4181125, 20905625]

約数ペア:

[(1, 20905625), (5, 4181125), (13, 1608125), (25, 836225), (31, 674375), (65, 321625), (83, 251875), (125, 167245), (155, 134875), (325, 64325), (403, 51875), (415, 50375), (625, 33449), (775, 26975), (1079, 19375), (1625, 12865), (2015, 10375), (2075, 10075), (2573, 8125), (3875, 5395)]