21128978

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{9791}}^1$

素因数の和:9889

約数の個数: 16

約数和(自身を含む): 34546176

約数和(自身を除く): 13417198

約数列:

[1, 2, 13, 26, 83, 166, 1079, 2158, 9791, 19582, 127283, 254566, 812653, 1625306, 10564489, 21128978]

約数ペア:

[(1, 21128978), (2, 10564489), (13, 1625306), (26, 812653), (83, 254566), (166, 127283), (1079, 19582), (2158, 9791)]