21418719

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53681}}^1$

素因数の和:53710

約数の個数: 16

約数和(自身を含む): 34356480

約数和(自身を除く): 12937761

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53681, 161043, 375767, 1019939, 1127301, 3059817, 7139573, 21418719]

約数ペア:

[(1, 21418719), (3, 7139573), (7, 3059817), (19, 1127301), (21, 1019939), (57, 375767), (133, 161043), (399, 53681)]