20781800

素因数分解:

$2^3\times 5^2\times {\mathrm{13}}^1\times {\mathrm{7993}}^1$

素因数の和:8022

約数の個数: 48

約数和(自身を含む): 52040940

約数和(自身を除く): 31259140

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 40, 50, 52, 65, 100, 104, 130, 200, 260, 325, 520, 650, 1300, 2600, 7993, 15986, 31972, 39965, 63944, 79930, 103909, 159860, 199825, 207818, 319720, 399650, 415636, 519545, 799300, 831272, 1039090, 1598600, 2078180, 2597725, 4156360, 5195450, 10390900, 20781800]

約数ペア:

[(1, 20781800), (2, 10390900), (4, 5195450), (5, 4156360), (8, 2597725), (10, 2078180), (13, 1598600), (20, 1039090), (25, 831272), (26, 799300), (40, 519545), (50, 415636), (52, 399650), (65, 319720), (100, 207818), (104, 199825), (130, 159860), (200, 103909), (260, 79930), (325, 63944), (520, 39965), (650, 31972), (1300, 15986), (2600, 7993)]