81741980

素因数分解:

$2^2\times 5^1\times {\mathrm{647}}^1\times {\mathrm{6317}}^1$

素因数の和:6973

約数の個数: 24

約数和(自身を含む): 171950688

約数和(自身を除く): 90208708

約数列:

[1, 2, 4, 5, 10, 20, 647, 1294, 2588, 3235, 6317, 6470, 12634, 12940, 25268, 31585, 63170, 126340, 4087099, 8174198, 16348396, 20435495, 40870990, 81741980]

約数ペア:

[(1, 81741980), (2, 40870990), (4, 20435495), (5, 16348396), (10, 8174198), (20, 4087099), (647, 126340), (1294, 63170), (2588, 31585), (3235, 25268), (6317, 12940), (6470, 12634)]