21060920

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{1693}}^1$

素因数の和:2015

約数の個数: 32

約数和(自身を含む): 47567520

約数和(自身を除く): 26506600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 1693, 2488, 3110, 3386, 6220, 6772, 8465, 12440, 13544, 16930, 33860, 67720, 526523, 1053046, 2106092, 2632615, 4212184, 5265230, 10530460, 21060920]

約数ペア:

[(1, 21060920), (2, 10530460), (4, 5265230), (5, 4212184), (8, 2632615), (10, 2106092), (20, 1053046), (40, 526523), (311, 67720), (622, 33860), (1244, 16930), (1555, 13544), (1693, 12440), (2488, 8465), (3110, 6772), (3386, 6220)]