19992147

素因数分解:

$3^1\times 7^2\times {\mathrm{307}}^1\times {\mathrm{443}}^1$

素因数の和:767

約数の個数: 24

約数和(自身を含む): 31179456

約数和(自身を除く): 11187309

約数列:

[1, 3, 7, 21, 49, 147, 307, 443, 921, 1329, 2149, 3101, 6447, 9303, 15043, 21707, 45129, 65121, 136001, 408003, 952007, 2856021, 6664049, 19992147]

約数ペア:

[(1, 19992147), (3, 6664049), (7, 2856021), (21, 952007), (49, 408003), (147, 136001), (307, 65121), (443, 45129), (921, 21707), (1329, 15043), (2149, 9303), (3101, 6447)]