81361780

素因数分解:

$2^2\times 5^1\times {\mathrm{823}}^1\times {\mathrm{4943}}^1$

素因数の和:5775

約数の個数: 24

約数和(自身を含む): 171101952

約数和(自身を除く): 89740172

約数列:

[1, 2, 4, 5, 10, 20, 823, 1646, 3292, 4115, 4943, 8230, 9886, 16460, 19772, 24715, 49430, 98860, 4068089, 8136178, 16272356, 20340445, 40680890, 81361780]

約数ペア:

[(1, 81361780), (2, 40680890), (4, 20340445), (5, 16272356), (10, 8136178), (20, 4068089), (823, 98860), (1646, 49430), (3292, 24715), (4115, 19772), (4943, 16460), (8230, 9886)]