20578750

素因数分解:

$2^1\times 5^4\times {\mathrm{101}}^1\times {\mathrm{163}}^1$

素因数の和:286

約数の個数: 40

約数和(自身を含む): 39193704

約数和(自身を除く): 18614954

約数列:

[1, 2, 5, 10, 25, 50, 101, 125, 163, 202, 250, 326, 505, 625, 815, 1010, 1250, 1630, 2525, 4075, 5050, 8150, 12625, 16463, 20375, 25250, 32926, 40750, 63125, 82315, 101875, 126250, 164630, 203750, 411575, 823150, 2057875, 4115750, 10289375, 20578750]

約数ペア:

[(1, 20578750), (2, 10289375), (5, 4115750), (10, 2057875), (25, 823150), (50, 411575), (101, 203750), (125, 164630), (163, 126250), (202, 101875), (250, 82315), (326, 63125), (505, 40750), (625, 32926), (815, 25250), (1010, 20375), (1250, 16463), (1630, 12625), (2525, 8150), (4075, 5050)]