20991747

素因数分解:

$3^1\times 7^2\times {\mathrm{61}}^1\times {\mathrm{2341}}^1$

素因数の和:2419

約数の個数: 24

約数和(自身を含む): 33106512

約数和(自身を除く): 12114765

約数列:

[1, 3, 7, 21, 49, 61, 147, 183, 427, 1281, 2341, 2989, 7023, 8967, 16387, 49161, 114709, 142801, 344127, 428403, 999607, 2998821, 6997249, 20991747]

約数ペア:

[(1, 20991747), (3, 6997249), (7, 2998821), (21, 999607), (49, 428403), (61, 344127), (147, 142801), (183, 114709), (427, 49161), (1281, 16387), (2341, 8967), (2989, 7023)]