19812500

素因数分解:

$2^2\times 5^6\times {\mathrm{317}}^1$

素因数の和:351

約数の個数: 42

約数和(自身を含む): 43476006

約数和(自身を除く): 23663506

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 317, 500, 625, 634, 1250, 1268, 1585, 2500, 3125, 3170, 6250, 6340, 7925, 12500, 15625, 15850, 31250, 31700, 39625, 62500, 79250, 158500, 198125, 396250, 792500, 990625, 1981250, 3962500, 4953125, 9906250, 19812500]

約数ペア:

[(1, 19812500), (2, 9906250), (4, 4953125), (5, 3962500), (10, 1981250), (20, 990625), (25, 792500), (50, 396250), (100, 198125), (125, 158500), (250, 79250), (317, 62500), (500, 39625), (625, 31700), (634, 31250), (1250, 15850), (1268, 15625), (1585, 12500), (2500, 7925), (3125, 6340), (3170, 6250)]