20865715

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{821}}^1$

素因数の和:879

約数の個数: 32

約数和(自身を含む): 29828736

約数和(自身を除く): 8963021

約数列:

[1, 5, 13, 17, 23, 65, 85, 115, 221, 299, 391, 821, 1105, 1495, 1955, 4105, 5083, 10673, 13957, 18883, 25415, 53365, 69785, 94415, 181441, 245479, 321011, 907205, 1227395, 1605055, 4173143, 20865715]

約数ペア:

[(1, 20865715), (5, 4173143), (13, 1605055), (17, 1227395), (23, 907205), (65, 321011), (85, 245479), (115, 181441), (221, 94415), (299, 69785), (391, 53365), (821, 25415), (1105, 18883), (1495, 13957), (1955, 10673), (4105, 5083)]