21988771

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1\times {\mathrm{293}}^1$

素因数の和:522

約数の個数: 16

約数和(自身を含む): 25740288

約数和(自身を除く): 3751517

約数列:

[1, 7, 71, 151, 293, 497, 1057, 2051, 10721, 20803, 44243, 75047, 145621, 309701, 3141253, 21988771]

約数ペア:

[(1, 21988771), (7, 3141253), (71, 309701), (151, 145621), (293, 75047), (497, 44243), (1057, 20803), (2051, 10721)]