20402500

素因数分解:

$2^2\times 5^4\times {\mathrm{8161}}^1$

素因数の和:8185

約数の個数: 30

約数和(自身を含む): 44621654

約数和(自身を除く): 24219154

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500, 625, 1250, 2500, 8161, 16322, 32644, 40805, 81610, 163220, 204025, 408050, 816100, 1020125, 2040250, 4080500, 5100625, 10201250, 20402500]

約数ペア:

[(1, 20402500), (2, 10201250), (4, 5100625), (5, 4080500), (10, 2040250), (20, 1020125), (25, 816100), (50, 408050), (100, 204025), (125, 163220), (250, 81610), (500, 40805), (625, 32644), (1250, 16322), (2500, 8161)]