21258985

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{101}}^1$

素因数の和:249

約数の個数: 32

約数和(自身を含む): 29082240

約数和(自身を除く): 7823255

約数列:

[1, 5, 11, 43, 55, 89, 101, 215, 445, 473, 505, 979, 1111, 2365, 3827, 4343, 4895, 5555, 8989, 19135, 21715, 42097, 44945, 47773, 98879, 210485, 238865, 386527, 494395, 1932635, 4251797, 21258985]

約数ペア:

[(1, 21258985), (5, 4251797), (11, 1932635), (43, 494395), (55, 386527), (89, 238865), (101, 210485), (215, 98879), (445, 47773), (473, 44945), (505, 42097), (979, 21715), (1111, 19135), (2365, 8989), (3827, 5555), (4343, 4895)]