20408900

素因数分解:

$2^2\times 5^2\times {\mathrm{127}}^1\times {\mathrm{1607}}^1$

素因数の和:1748

約数の個数: 36

約数和(自身を含む): 44663808

約数和(自身を除く): 24254908

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 127, 254, 508, 635, 1270, 1607, 2540, 3175, 3214, 6350, 6428, 8035, 12700, 16070, 32140, 40175, 80350, 160700, 204089, 408178, 816356, 1020445, 2040890, 4081780, 5102225, 10204450, 20408900]

約数ペア:

[(1, 20408900), (2, 10204450), (4, 5102225), (5, 4081780), (10, 2040890), (20, 1020445), (25, 816356), (50, 408178), (100, 204089), (127, 160700), (254, 80350), (508, 40175), (635, 32140), (1270, 16070), (1607, 12700), (2540, 8035), (3175, 6428), (3214, 6350)]