20987477

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{2137}}^1$

素因数の和:2228

約数の個数: 16

約数和(自身を含む): 25450752

約数和(自身を除く): 4463275

約数列:

[1, 7, 23, 61, 161, 427, 1403, 2137, 9821, 14959, 49151, 130357, 344057, 912499, 2998211, 20987477]

約数ペア:

[(1, 20987477), (7, 2998211), (23, 912499), (61, 344057), (161, 130357), (427, 49151), (1403, 14959), (2137, 9821)]