81249955

素因数分解:

$5^1\times {\mathrm{101}}^1\times {\mathrm{251}}^1\times {\mathrm{641}}^1$

素因数の和:998

約数の個数: 16

約数和(自身を含む): 99011808

約数和(自身を除く): 17761853

約数列:

[1, 5, 101, 251, 505, 641, 1255, 3205, 25351, 64741, 126755, 160891, 323705, 804455, 16249991, 81249955]

約数ペア:

[(1, 81249955), (5, 16249991), (101, 804455), (251, 323705), (505, 160891), (641, 126755), (1255, 64741), (3205, 25351)]