21578500

素因数分解:

$2^2\times 5^3\times {\mathrm{103}}^1\times {\mathrm{419}}^1$

素因数の和:541

約数の個数: 48

約数和(自身を含む): 47698560

約数和(自身を除く): 26120060

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 103, 125, 206, 250, 412, 419, 500, 515, 838, 1030, 1676, 2060, 2095, 2575, 4190, 5150, 8380, 10300, 10475, 12875, 20950, 25750, 41900, 43157, 51500, 52375, 86314, 104750, 172628, 209500, 215785, 431570, 863140, 1078925, 2157850, 4315700, 5394625, 10789250, 21578500]

約数ペア:

[(1, 21578500), (2, 10789250), (4, 5394625), (5, 4315700), (10, 2157850), (20, 1078925), (25, 863140), (50, 431570), (100, 215785), (103, 209500), (125, 172628), (206, 104750), (250, 86314), (412, 52375), (419, 51500), (500, 43157), (515, 41900), (838, 25750), (1030, 20950), (1676, 12875), (2060, 10475), (2095, 10300), (2575, 8380), (4190, 5150)]