20781765

素因数分解:

$3^4\times 5^1\times {\mathrm{23}}^2\times {\mathrm{97}}^1$

素因数の和:160

約数の個数: 60

約数和(自身を含む): 39344844

約数和(自身を除く): 18563079

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 81, 97, 115, 135, 207, 291, 345, 405, 485, 529, 621, 873, 1035, 1455, 1587, 1863, 2231, 2619, 2645, 3105, 4365, 4761, 6693, 7857, 7935, 9315, 11155, 13095, 14283, 20079, 23805, 33465, 39285, 42849, 51313, 60237, 71415, 100395, 153939, 180711, 214245, 256565, 301185, 461817, 769695, 903555, 1385451, 2309085, 4156353, 6927255, 20781765]

約数ペア:

[(1, 20781765), (3, 6927255), (5, 4156353), (9, 2309085), (15, 1385451), (23, 903555), (27, 769695), (45, 461817), (69, 301185), (81, 256565), (97, 214245), (115, 180711), (135, 153939), (207, 100395), (291, 71415), (345, 60237), (405, 51313), (485, 42849), (529, 39285), (621, 33465), (873, 23805), (1035, 20079), (1455, 14283), (1587, 13095), (1863, 11155), (2231, 9315), (2619, 7935), (2645, 7857), (3105, 6693), (4365, 4761)]