19971250

素因数分解:

$2^1\times 5^4\times {\mathrm{13}}^1\times {\mathrm{1229}}^1$

素因数の和:1264

約数の個数: 40

約数和(自身を含む): 40346460

約数和(自身を除く): 20375210

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 125, 130, 250, 325, 625, 650, 1229, 1250, 1625, 2458, 3250, 6145, 8125, 12290, 15977, 16250, 30725, 31954, 61450, 79885, 153625, 159770, 307250, 399425, 768125, 798850, 1536250, 1997125, 3994250, 9985625, 19971250]

約数ペア:

[(1, 19971250), (2, 9985625), (5, 3994250), (10, 1997125), (13, 1536250), (25, 798850), (26, 768125), (50, 399425), (65, 307250), (125, 159770), (130, 153625), (250, 79885), (325, 61450), (625, 31954), (650, 30725), (1229, 16250), (1250, 15977), (1625, 12290), (2458, 8125), (3250, 6145)]