21990783

素因数分解:

$3^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{6781}}^1$

素因数の和:6854

約数の個数: 16

約数和(自身を含む): 31251456

約数和(自身を除く): 9260673

約数列:

[1, 3, 23, 47, 69, 141, 1081, 3243, 6781, 20343, 155963, 318707, 467889, 956121, 7330261, 21990783]

約数ペア:

[(1, 21990783), (3, 7330261), (23, 956121), (47, 467889), (69, 318707), (141, 155963), (1081, 20343), (3243, 6781)]