21387428

素因数分解:

$2^2\times {\mathrm{17}}^1\times {\mathrm{409}}^1\times {\mathrm{769}}^1$

素因数の和:1199

約数の個数: 24

約数和(自身を含む): 39778200

約数和(自身を除く): 18390772

約数列:

[1, 2, 4, 17, 34, 68, 409, 769, 818, 1538, 1636, 3076, 6953, 13073, 13906, 26146, 27812, 52292, 314521, 629042, 1258084, 5346857, 10693714, 21387428]

約数ペア:

[(1, 21387428), (2, 10693714), (4, 5346857), (17, 1258084), (34, 629042), (68, 314521), (409, 52292), (769, 27812), (818, 26146), (1538, 13906), (1636, 13073), (3076, 6953)]