21018501

素因数分解:

$3^3\times 7^2\times {\mathrm{15887}}^1$

素因数の和:15910

約数の個数: 24

約数和(自身を含む): 36224640

約数和(自身を除く): 15206139

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 15887, 47661, 111209, 142983, 333627, 428949, 778463, 1000881, 2335389, 3002643, 7006167, 21018501]

約数ペア:

[(1, 21018501), (3, 7006167), (7, 3002643), (9, 2335389), (21, 1000881), (27, 778463), (49, 428949), (63, 333627), (147, 142983), (189, 111209), (441, 47661), (1323, 15887)]