19995625

素因数分解:

$5^4\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{107}}^1$

素因数の和:163

約数の個数: 40

約数和(自身を含む): 28340928

約数和(自身を除く): 8345303

約数列:

[1, 5, 13, 23, 25, 65, 107, 115, 125, 299, 325, 535, 575, 625, 1391, 1495, 1625, 2461, 2675, 2875, 6955, 7475, 8125, 12305, 13375, 14375, 31993, 34775, 37375, 61525, 66875, 159965, 173875, 186875, 307625, 799825, 869375, 1538125, 3999125, 19995625]

約数ペア:

[(1, 19995625), (5, 3999125), (13, 1538125), (23, 869375), (25, 799825), (65, 307625), (107, 186875), (115, 173875), (125, 159965), (299, 66875), (325, 61525), (535, 37375), (575, 34775), (625, 31993), (1391, 14375), (1495, 13375), (1625, 12305), (2461, 8125), (2675, 7475), (2875, 6955)]