21705999

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{54401}}^1$

素因数の和:54430

約数の個数: 16

約数和(自身を含む): 34817280

約数和(自身を除く): 13111281

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 54401, 163203, 380807, 1033619, 1142421, 3100857, 7235333, 21705999]

約数ペア:

[(1, 21705999), (3, 7235333), (7, 3100857), (19, 1142421), (21, 1033619), (57, 380807), (133, 163203), (399, 54401)]