21392680

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{2081}}^1$

素因数の和:2349

約数の個数: 32

約数和(自身を含む): 48344040

約数和(自身を除く): 26951360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2081, 2570, 4162, 5140, 8324, 10280, 10405, 16648, 20810, 41620, 83240, 534817, 1069634, 2139268, 2674085, 4278536, 5348170, 10696340, 21392680]

約数ペア:

[(1, 21392680), (2, 10696340), (4, 5348170), (5, 4278536), (8, 2674085), (10, 2139268), (20, 1069634), (40, 534817), (257, 83240), (514, 41620), (1028, 20810), (1285, 16648), (2056, 10405), (2081, 10280), (2570, 8324), (4162, 5140)]