21576875

素因数分解:

$5^4\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1$

素因数の和:141

約数の個数: 40

約数和(自身を含む): 29990400

約数和(自身を除く): 8413525

約数列:

[1, 5, 19, 23, 25, 79, 95, 115, 125, 395, 437, 475, 575, 625, 1501, 1817, 1975, 2185, 2375, 2875, 7505, 9085, 9875, 10925, 11875, 14375, 34523, 37525, 45425, 49375, 54625, 172615, 187625, 227125, 273125, 863075, 938125, 1135625, 4315375, 21576875]

約数ペア:

[(1, 21576875), (5, 4315375), (19, 1135625), (23, 938125), (25, 863075), (79, 273125), (95, 227125), (115, 187625), (125, 172615), (395, 54625), (437, 49375), (475, 45425), (575, 37525), (625, 34523), (1501, 14375), (1817, 11875), (1975, 10925), (2185, 9875), (2375, 9085), (2875, 7505)]