21389284

素因数分解:

$2^2\times 7^2\times {\mathrm{61}}^1\times {\mathrm{1789}}^1$

素因数の和:1868

約数の個数: 36

約数和(自身を含む): 44281020

約数和(自身を除く): 22891736

約数列:

[1, 2, 4, 7, 14, 28, 49, 61, 98, 122, 196, 244, 427, 854, 1708, 1789, 2989, 3578, 5978, 7156, 11956, 12523, 25046, 50092, 87661, 109129, 175322, 218258, 350644, 436516, 763903, 1527806, 3055612, 5347321, 10694642, 21389284]

約数ペア:

[(1, 21389284), (2, 10694642), (4, 5347321), (7, 3055612), (14, 1527806), (28, 763903), (49, 436516), (61, 350644), (98, 218258), (122, 175322), (196, 109129), (244, 87661), (427, 50092), (854, 25046), (1708, 12523), (1789, 11956), (2989, 7156), (3578, 5978)]