21056780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25679}}^1$

素因数の和:25729

約数の個数: 24

約数和(自身を含む): 45299520

約数和(自身を除く): 24242740

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25679, 51358, 102716, 128395, 256790, 513580, 1052839, 2105678, 4211356, 5264195, 10528390, 21056780]

約数ペア:

[(1, 21056780), (2, 10528390), (4, 5264195), (5, 4211356), (10, 2105678), (20, 1052839), (41, 513580), (82, 256790), (164, 128395), (205, 102716), (410, 51358), (820, 25679)]