21278025

素因数分解:

$3^3\times 5^2\times {\mathrm{29}}^1\times {\mathrm{1087}}^1$

素因数の和:1135

約数の個数: 48

約数和(自身を含む): 40473600

約数和(自身を除く): 19195575

約数列:

[1, 3, 5, 9, 15, 25, 27, 29, 45, 75, 87, 135, 145, 225, 261, 435, 675, 725, 783, 1087, 1305, 2175, 3261, 3915, 5435, 6525, 9783, 16305, 19575, 27175, 29349, 31523, 48915, 81525, 94569, 146745, 157615, 244575, 283707, 472845, 733725, 788075, 851121, 1418535, 2364225, 4255605, 7092675, 21278025]

約数ペア:

[(1, 21278025), (3, 7092675), (5, 4255605), (9, 2364225), (15, 1418535), (25, 851121), (27, 788075), (29, 733725), (45, 472845), (75, 283707), (87, 244575), (135, 157615), (145, 146745), (225, 94569), (261, 81525), (435, 48915), (675, 31523), (725, 29349), (783, 27175), (1087, 19575), (1305, 16305), (2175, 9783), (3261, 6525), (3915, 5435)]