19998520

素因数分解:

$2^3\times 5^1\times {\mathrm{263}}^1\times {\mathrm{1901}}^1$

素因数の和:2175

約数の個数: 32

約数和(自身を含む): 45191520

約数和(自身を除く): 25193000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 263, 526, 1052, 1315, 1901, 2104, 2630, 3802, 5260, 7604, 9505, 10520, 15208, 19010, 38020, 76040, 499963, 999926, 1999852, 2499815, 3999704, 4999630, 9999260, 19998520]

約数ペア:

[(1, 19998520), (2, 9999260), (4, 4999630), (5, 3999704), (8, 2499815), (10, 1999852), (20, 999926), (40, 499963), (263, 76040), (526, 38020), (1052, 19010), (1315, 15208), (1901, 10520), (2104, 9505), (2630, 7604), (3802, 5260)]