20721561

素因数分解:

$3^1\times 7^2\times {\mathrm{73}}^1\times {\mathrm{1931}}^1$

素因数の和:2021

約数の個数: 24

約数和(自身を含む): 32596704

約数和(自身を除く): 11875143

約数列:

[1, 3, 7, 21, 49, 73, 147, 219, 511, 1533, 1931, 3577, 5793, 10731, 13517, 40551, 94619, 140963, 283857, 422889, 986741, 2960223, 6907187, 20721561]

約数ペア:

[(1, 20721561), (3, 6907187), (7, 2960223), (21, 986741), (49, 422889), (73, 283857), (147, 140963), (219, 94619), (511, 40551), (1533, 13517), (1931, 10731), (3577, 5793)]