1998400

素因数分解:

$2^6\times 5^2\times {\mathrm{1249}}^1$

素因数の和:1271

約数の個数: 42

約数和(自身を含む): 4921250

約数和(自身を除く): 2922850

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 160, 200, 320, 400, 800, 1249, 1600, 2498, 4996, 6245, 9992, 12490, 19984, 24980, 31225, 39968, 49960, 62450, 79936, 99920, 124900, 199840, 249800, 399680, 499600, 999200, 1998400]

約数ペア:

[(1, 1998400), (2, 999200), (4, 499600), (5, 399680), (8, 249800), (10, 199840), (16, 124900), (20, 99920), (25, 79936), (32, 62450), (40, 49960), (50, 39968), (64, 31225), (80, 24980), (100, 19984), (160, 12490), (200, 9992), (320, 6245), (400, 4996), (800, 2498), (1249, 1600)]