21166785

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{401}}^1$

素因数の和:455

約数の個数: 64

約数和(自身を含む): 41679360

約数和(自身を除く): 20512575

約数列:

[1, 3, 5, 9, 15, 17, 23, 27, 45, 51, 69, 85, 115, 135, 153, 207, 255, 345, 391, 401, 459, 621, 765, 1035, 1173, 1203, 1955, 2005, 2295, 3105, 3519, 3609, 5865, 6015, 6817, 9223, 10557, 10827, 17595, 18045, 20451, 27669, 34085, 46115, 52785, 54135, 61353, 83007, 102255, 138345, 156791, 184059, 249021, 306765, 415035, 470373, 783955, 920295, 1245105, 1411119, 2351865, 4233357, 7055595, 21166785]

約数ペア:

[(1, 21166785), (3, 7055595), (5, 4233357), (9, 2351865), (15, 1411119), (17, 1245105), (23, 920295), (27, 783955), (45, 470373), (51, 415035), (69, 306765), (85, 249021), (115, 184059), (135, 156791), (153, 138345), (207, 102255), (255, 83007), (345, 61353), (391, 54135), (401, 52785), (459, 46115), (621, 34085), (765, 27669), (1035, 20451), (1173, 18045), (1203, 17595), (1955, 10827), (2005, 10557), (2295, 9223), (3105, 6817), (3519, 6015), (3609, 5865)]