21280401

素因数分解:

$3^4\times {\mathrm{53}}^1\times {\mathrm{4957}}^1$

素因数の和:5022

約数の個数: 20

約数和(自身を含む): 32395572

約数和(自身を除く): 11115171

約数列:

[1, 3, 9, 27, 53, 81, 159, 477, 1431, 4293, 4957, 14871, 44613, 133839, 262721, 401517, 788163, 2364489, 7093467, 21280401]

約数ペア:

[(1, 21280401), (3, 7093467), (9, 2364489), (27, 788163), (53, 401517), (81, 262721), (159, 133839), (477, 44613), (1431, 14871), (4293, 4957)]