21705345

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1669}}^1$

素因数の和:1714

約数の個数: 36

約数和(自身を含む): 39989820

約数和(自身を除く): 18284475

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 289, 765, 867, 1445, 1669, 2601, 4335, 5007, 8345, 13005, 15021, 25035, 28373, 75105, 85119, 141865, 255357, 425595, 482341, 1276785, 1447023, 2411705, 4341069, 7235115, 21705345]

約数ペア:

[(1, 21705345), (3, 7235115), (5, 4341069), (9, 2411705), (15, 1447023), (17, 1276785), (45, 482341), (51, 425595), (85, 255357), (153, 141865), (255, 85119), (289, 75105), (765, 28373), (867, 25035), (1445, 15021), (1669, 13005), (2601, 8345), (4335, 5007)]