20001220

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{12659}}^1$

素因数の和:12747

約数の個数: 24

約数和(自身を含む): 42537600

約数和(自身を除く): 22536380

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 12659, 25318, 50636, 63295, 126590, 253180, 1000061, 2000122, 4000244, 5000305, 10000610, 20001220]

約数ペア:

[(1, 20001220), (2, 10000610), (4, 5000305), (5, 4000244), (10, 2000122), (20, 1000061), (79, 253180), (158, 126590), (316, 63295), (395, 50636), (790, 25318), (1580, 12659)]