18881000

素因数分解:

$2^3\times 5^3\times {\mathrm{79}}^1\times {\mathrm{239}}^1$

素因数の和:339

約数の個数: 64

約数和(自身を含む): 44928000

約数和(自身を除く): 26047000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 79, 100, 125, 158, 200, 239, 250, 316, 395, 478, 500, 632, 790, 956, 1000, 1195, 1580, 1912, 1975, 2390, 3160, 3950, 4780, 5975, 7900, 9560, 9875, 11950, 15800, 18881, 19750, 23900, 29875, 37762, 39500, 47800, 59750, 75524, 79000, 94405, 119500, 151048, 188810, 239000, 377620, 472025, 755240, 944050, 1888100, 2360125, 3776200, 4720250, 9440500, 18881000]

約数ペア:

[(1, 18881000), (2, 9440500), (4, 4720250), (5, 3776200), (8, 2360125), (10, 1888100), (20, 944050), (25, 755240), (40, 472025), (50, 377620), (79, 239000), (100, 188810), (125, 151048), (158, 119500), (200, 94405), (239, 79000), (250, 75524), (316, 59750), (395, 47800), (478, 39500), (500, 37762), (632, 29875), (790, 23900), (956, 19750), (1000, 18881), (1195, 15800), (1580, 11950), (1912, 9875), (1975, 9560), (2390, 7900), (3160, 5975), (3950, 4780)]