20787100

素因数分解:

$2^2\times 5^2\times {\mathrm{97}}^1\times {\mathrm{2143}}^1$

素因数の和:2254

約数の個数: 36

約数和(自身を含む): 45594304

約数和(自身を除く): 24807204

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 97, 100, 194, 388, 485, 970, 1940, 2143, 2425, 4286, 4850, 8572, 9700, 10715, 21430, 42860, 53575, 107150, 207871, 214300, 415742, 831484, 1039355, 2078710, 4157420, 5196775, 10393550, 20787100]

約数ペア:

[(1, 20787100), (2, 10393550), (4, 5196775), (5, 4157420), (10, 2078710), (20, 1039355), (25, 831484), (50, 415742), (97, 214300), (100, 207871), (194, 107150), (388, 53575), (485, 42860), (970, 21430), (1940, 10715), (2143, 9700), (2425, 8572), (4286, 4850)]