19728865

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{9791}}^1$

素因数の和:9840

約数の個数: 16

約数和(自身を含む): 26320896

約数和(自身を除く): 6592031

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 9791, 48955, 127283, 303521, 636415, 1517605, 3945773, 19728865]

約数ペア:

[(1, 19728865), (5, 3945773), (13, 1517605), (31, 636415), (65, 303521), (155, 127283), (403, 48955), (2015, 9791)]