21162025

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{29}}^1\times {\mathrm{101}}^1$

素因数の和:174

約数の個数: 36

約数和(自身を含む): 29122020

約数和(自身を除く): 7959995

約数列:

[1, 5, 17, 25, 29, 85, 101, 145, 289, 425, 493, 505, 725, 1445, 1717, 2465, 2525, 2929, 7225, 8381, 8585, 12325, 14645, 29189, 41905, 42925, 49793, 73225, 145945, 209525, 248965, 729725, 846481, 1244825, 4232405, 21162025]

約数ペア:

[(1, 21162025), (5, 4232405), (17, 1244825), (25, 846481), (29, 729725), (85, 248965), (101, 209525), (145, 145945), (289, 73225), (425, 49793), (493, 42925), (505, 41905), (725, 29189), (1445, 14645), (1717, 12325), (2465, 8585), (2525, 8381), (2929, 7225)]