19898125

素因数分解:

$5^4\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1$

素因数の和:143

約数の個数: 40

約数和(自身を含む): 27991040

約数和(自身を除く): 8092915

約数列:

[1, 5, 13, 25, 31, 65, 79, 125, 155, 325, 395, 403, 625, 775, 1027, 1625, 1975, 2015, 2449, 3875, 5135, 8125, 9875, 10075, 12245, 19375, 25675, 31837, 49375, 50375, 61225, 128375, 159185, 251875, 306125, 641875, 795925, 1530625, 3979625, 19898125]

約数ペア:

[(1, 19898125), (5, 3979625), (13, 1530625), (25, 795925), (31, 641875), (65, 306125), (79, 251875), (125, 159185), (155, 128375), (325, 61225), (395, 50375), (403, 49375), (625, 31837), (775, 25675), (1027, 19375), (1625, 12245), (1975, 10075), (2015, 9875), (2449, 8125), (3875, 5135)]