21237795

素因数分解:

$3^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{1279}}^1$

素因数の和:1337

約数の個数: 40

約数和(自身を含む): 39029760

約数和(自身を除く): 17791965

約数列:

[1, 3, 5, 9, 15, 27, 41, 45, 81, 123, 135, 205, 369, 405, 615, 1107, 1279, 1845, 3321, 3837, 5535, 6395, 11511, 16605, 19185, 34533, 52439, 57555, 103599, 157317, 172665, 262195, 471951, 517995, 786585, 1415853, 2359755, 4247559, 7079265, 21237795]

約数ペア:

[(1, 21237795), (3, 7079265), (5, 4247559), (9, 2359755), (15, 1415853), (27, 786585), (41, 517995), (45, 471951), (81, 262195), (123, 172665), (135, 157317), (205, 103599), (369, 57555), (405, 52439), (615, 34533), (1107, 19185), (1279, 16605), (1845, 11511), (3321, 6395), (3837, 5535)]