21010405

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{10427}}^1$

素因数の和:10476

約数の個数: 16

約数和(自身を含む): 28030464

約数和(自身を除く): 7020059

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 10427, 52135, 135551, 323237, 677755, 1616185, 4202081, 21010405]

約数ペア:

[(1, 21010405), (5, 4202081), (13, 1616185), (31, 677755), (65, 323237), (155, 135551), (403, 52135), (2015, 10427)]