21806564

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{3061}}^1$

素因数の和:3215

約数の個数: 24

約数和(自身を含む): 41410488

約数和(自身を除く): 19603924

約数列:

[1, 2, 4, 13, 26, 52, 137, 274, 548, 1781, 3061, 3562, 6122, 7124, 12244, 39793, 79586, 159172, 419357, 838714, 1677428, 5451641, 10903282, 21806564]

約数ペア:

[(1, 21806564), (2, 10903282), (4, 5451641), (13, 1677428), (26, 838714), (52, 419357), (137, 159172), (274, 79586), (548, 39793), (1781, 12244), (3061, 7124), (3562, 6122)]