21781004

素因数分解:

$2^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{18973}}^1$

素因数の和:19025

約数の個数: 24

約数和(自身を含む): 44626848

約数和(自身を除く): 22845844

約数列:

[1, 2, 4, 7, 14, 28, 41, 82, 164, 287, 574, 1148, 18973, 37946, 75892, 132811, 265622, 531244, 777893, 1555786, 3111572, 5445251, 10890502, 21781004]

約数ペア:

[(1, 21781004), (2, 10890502), (4, 5445251), (7, 3111572), (14, 1555786), (28, 777893), (41, 531244), (82, 265622), (164, 132811), (287, 75892), (574, 37946), (1148, 18973)]