81720290

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{115099}}^1$

素因数の和:115177

約数の個数: 16

約数和(自身を含む): 149169600

約数和(自身を除く): 67449310

約数列:

[1, 2, 5, 10, 71, 142, 355, 710, 115099, 230198, 575495, 1150990, 8172029, 16344058, 40860145, 81720290]

約数ペア:

[(1, 81720290), (2, 40860145), (5, 16344058), (10, 8172029), (71, 1150990), (142, 575495), (355, 230198), (710, 115099)]