19781255

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{9817}}^1$

素因数の和:9866

約数の個数: 16

約数和(自身を含む): 26390784

約数和(自身を除く): 6609529

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 9817, 49085, 127621, 304327, 638105, 1521635, 3956251, 19781255]

約数ペア:

[(1, 19781255), (5, 3956251), (13, 1521635), (31, 638105), (65, 304327), (155, 127621), (403, 49085), (2015, 9817)]