19911591

素因数分解:

$3^2\times 7^2\times {\mathrm{163}}^1\times {\mathrm{277}}^1$

素因数の和:460

約数の個数: 36

約数和(自身を含む): 33783672

約数和(自身を除く): 13872081

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 163, 277, 441, 489, 831, 1141, 1467, 1939, 2493, 3423, 5817, 7987, 10269, 13573, 17451, 23961, 40719, 45151, 71883, 122157, 135453, 316057, 406359, 948171, 2212399, 2844513, 6637197, 19911591]

約数ペア:

[(1, 19911591), (3, 6637197), (7, 2844513), (9, 2212399), (21, 948171), (49, 406359), (63, 316057), (147, 135453), (163, 122157), (277, 71883), (441, 45151), (489, 40719), (831, 23961), (1141, 17451), (1467, 13573), (1939, 10269), (2493, 7987), (3423, 5817)]