21353885

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{19681}}^1$

素因数の和:19724

約数の個数: 16

約数和(自身を含む): 30231552

約数和(自身を除く): 8877667

約数列:

[1, 5, 7, 31, 35, 155, 217, 1085, 19681, 98405, 137767, 610111, 688835, 3050555, 4270777, 21353885]

約数ペア:

[(1, 21353885), (5, 4270777), (7, 3050555), (31, 688835), (35, 610111), (155, 137767), (217, 98405), (1085, 19681)]