21191660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{229}}^1\times {\mathrm{661}}^1$

素因数の和:906

約数の個数: 48

約数和(自身を含む): 51159360

約数和(自身を除く): 29967700

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 229, 458, 661, 916, 1145, 1322, 1603, 2290, 2644, 3206, 3305, 4580, 4627, 6412, 6610, 8015, 9254, 13220, 16030, 18508, 23135, 32060, 46270, 92540, 151369, 302738, 605476, 756845, 1059583, 1513690, 2119166, 3027380, 4238332, 5297915, 10595830, 21191660]

約数ペア:

[(1, 21191660), (2, 10595830), (4, 5297915), (5, 4238332), (7, 3027380), (10, 2119166), (14, 1513690), (20, 1059583), (28, 756845), (35, 605476), (70, 302738), (140, 151369), (229, 92540), (458, 46270), (661, 32060), (916, 23135), (1145, 18508), (1322, 16030), (1603, 13220), (2290, 9254), (2644, 8015), (3206, 6610), (3305, 6412), (4580, 4627)]