20987145

素因数分解:

$3^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{9923}}^1$

素因数の和:9981

約数の個数: 24

約数和(自身を含む): 37155456

約数和(自身を除く): 16168311

約数列:

[1, 3, 5, 9, 15, 45, 47, 141, 235, 423, 705, 2115, 9923, 29769, 49615, 89307, 148845, 446535, 466381, 1399143, 2331905, 4197429, 6995715, 20987145]

約数ペア:

[(1, 20987145), (3, 6995715), (5, 4197429), (9, 2331905), (15, 1399143), (45, 466381), (47, 446535), (141, 148845), (235, 89307), (423, 49615), (705, 29769), (2115, 9923)]