19987900

素因数分解:

$2^2\times 5^2\times {\mathrm{101}}^1\times {\mathrm{1979}}^1$

素因数の和:2094

約数の個数: 36

約数和(自身を含む): 43825320

約数和(自身を除く): 23837420

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 101, 202, 404, 505, 1010, 1979, 2020, 2525, 3958, 5050, 7916, 9895, 10100, 19790, 39580, 49475, 98950, 197900, 199879, 399758, 799516, 999395, 1998790, 3997580, 4996975, 9993950, 19987900]

約数ペア:

[(1, 19987900), (2, 9993950), (4, 4996975), (5, 3997580), (10, 1998790), (20, 999395), (25, 799516), (50, 399758), (100, 199879), (101, 197900), (202, 98950), (404, 49475), (505, 39580), (1010, 19790), (1979, 10100), (2020, 9895), (2525, 7916), (3958, 5050)]