21285800

素因数分解:

$2^3\times 5^2\times {\mathrm{71}}^1\times {\mathrm{1499}}^1$

素因数の和:1586

約数の個数: 48

約数和(自身を含む): 50220000

約数和(自身を除く): 28934200

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 71, 100, 142, 200, 284, 355, 568, 710, 1420, 1499, 1775, 2840, 2998, 3550, 5996, 7100, 7495, 11992, 14200, 14990, 29980, 37475, 59960, 74950, 106429, 149900, 212858, 299800, 425716, 532145, 851432, 1064290, 2128580, 2660725, 4257160, 5321450, 10642900, 21285800]

約数ペア:

[(1, 21285800), (2, 10642900), (4, 5321450), (5, 4257160), (8, 2660725), (10, 2128580), (20, 1064290), (25, 851432), (40, 532145), (50, 425716), (71, 299800), (100, 212858), (142, 149900), (200, 106429), (284, 74950), (355, 59960), (568, 37475), (710, 29980), (1420, 14990), (1499, 14200), (1775, 11992), (2840, 7495), (2998, 7100), (3550, 5996)]