19957900

素因数分解:

$2^2\times 5^2\times {\mathrm{109}}^1\times {\mathrm{1831}}^1$

素因数の和:1954

約数の個数: 36

約数和(自身を含む): 43729840

約数和(自身を除く): 23771940

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 109, 218, 436, 545, 1090, 1831, 2180, 2725, 3662, 5450, 7324, 9155, 10900, 18310, 36620, 45775, 91550, 183100, 199579, 399158, 798316, 997895, 1995790, 3991580, 4989475, 9978950, 19957900]

約数ペア:

[(1, 19957900), (2, 9978950), (4, 4989475), (5, 3991580), (10, 1995790), (20, 997895), (25, 798316), (50, 399158), (100, 199579), (109, 183100), (218, 91550), (436, 45775), (545, 36620), (1090, 18310), (1831, 10900), (2180, 9155), (2725, 7324), (3662, 5450)]