21788156

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{167}}^1\times {\mathrm{193}}^1$

素因数の和:390

約数の個数: 36

約数和(自身を含む): 41750352

約数和(自身を除く): 19962196

約数列:

[1, 2, 4, 13, 26, 52, 167, 169, 193, 334, 338, 386, 668, 676, 772, 2171, 2509, 4342, 5018, 8684, 10036, 28223, 32231, 32617, 56446, 64462, 65234, 112892, 128924, 130468, 419003, 838006, 1676012, 5447039, 10894078, 21788156]

約数ペア:

[(1, 21788156), (2, 10894078), (4, 5447039), (13, 1676012), (26, 838006), (52, 419003), (167, 130468), (169, 128924), (193, 112892), (334, 65234), (338, 64462), (386, 56446), (668, 32617), (676, 32231), (772, 28223), (2171, 10036), (2509, 8684), (4342, 5018)]