21725405

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19661}}^1$

素因数の和:19696

約数の個数: 16

約数和(自身を含む): 29728944

約数和(自身を除く): 8003539

約数列:

[1, 5, 13, 17, 65, 85, 221, 1105, 19661, 98305, 255593, 334237, 1277965, 1671185, 4345081, 21725405]

約数ペア:

[(1, 21725405), (5, 4345081), (13, 1671185), (17, 1277965), (65, 334237), (85, 255593), (221, 98305), (1105, 19661)]