21293209

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1\times {\mathrm{1061}}^1$

素因数の和:1176

約数の個数: 16

約数和(自身を含む): 25284096

約数和(自身を除く): 3990887

約数列:

[1, 7, 47, 61, 329, 427, 1061, 2867, 7427, 20069, 49867, 64721, 349069, 453047, 3041887, 21293209]

約数ペア:

[(1, 21293209), (7, 3041887), (47, 453047), (61, 349069), (329, 64721), (427, 49867), (1061, 20069), (2867, 7427)]