18991375

素因数分解:

$5^3\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{31}}^1$

素因数の和:101

約数の個数: 48

約数和(自身を含む): 27406080

約数和(自身を除く): 8414705

約数列:

[1, 5, 13, 25, 29, 31, 65, 125, 145, 155, 169, 325, 377, 403, 725, 775, 845, 899, 1625, 1885, 2015, 3625, 3875, 4225, 4495, 4901, 5239, 9425, 10075, 11687, 21125, 22475, 24505, 26195, 47125, 50375, 58435, 112375, 122525, 130975, 151931, 292175, 612625, 654875, 759655, 1460875, 3798275, 18991375]

約数ペア:

[(1, 18991375), (5, 3798275), (13, 1460875), (25, 759655), (29, 654875), (31, 612625), (65, 292175), (125, 151931), (145, 130975), (155, 122525), (169, 112375), (325, 58435), (377, 50375), (403, 47125), (725, 26195), (775, 24505), (845, 22475), (899, 21125), (1625, 11687), (1885, 10075), (2015, 9425), (3625, 5239), (3875, 4901), (4225, 4495)]