21512780

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^2\times {\mathrm{1279}}^1$

素因数の和:1346

約数の個数: 36

約数和(自身を含む): 46824960

約数和(自身を除く): 25312180

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 841, 1279, 1682, 2558, 3364, 4205, 5116, 6395, 8410, 12790, 16820, 25580, 37091, 74182, 148364, 185455, 370910, 741820, 1075639, 2151278, 4302556, 5378195, 10756390, 21512780]

約数ペア:

[(1, 21512780), (2, 10756390), (4, 5378195), (5, 4302556), (10, 2151278), (20, 1075639), (29, 741820), (58, 370910), (116, 185455), (145, 148364), (290, 74182), (580, 37091), (841, 25580), (1279, 16820), (1682, 12790), (2558, 8410), (3364, 6395), (4205, 5116)]