81916280

素因数分解:

$2^3\times 5^1\times {\mathrm{401}}^1\times {\mathrm{5107}}^1$

素因数の和:5519

約数の個数: 32

約数和(自身を含む): 184807440

約数和(自身を除く): 102891160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 401, 802, 1604, 2005, 3208, 4010, 5107, 8020, 10214, 16040, 20428, 25535, 40856, 51070, 102140, 204280, 2047907, 4095814, 8191628, 10239535, 16383256, 20479070, 40958140, 81916280]

約数ペア:

[(1, 81916280), (2, 40958140), (4, 20479070), (5, 16383256), (8, 10239535), (10, 8191628), (20, 4095814), (40, 2047907), (401, 204280), (802, 102140), (1604, 51070), (2005, 40856), (3208, 25535), (4010, 20428), (5107, 16040), (8020, 10214)]