20908909

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{2129}}^1$

素因数の和:2220

約数の個数: 16

約数和(自身を含む): 25355520

約数和(自身を除く): 4446611

約数列:

[1, 7, 23, 61, 161, 427, 1403, 2129, 9821, 14903, 48967, 129869, 342769, 909083, 2986987, 20908909]

約数ペア:

[(1, 20908909), (7, 2986987), (23, 909083), (61, 342769), (161, 129869), (427, 48967), (1403, 14903), (2129, 9821)]