19978847

素因数分解:

$7^1\times {\mathrm{83}}^1\times {\mathrm{137}}^1\times {\mathrm{251}}^1$

素因数の和:478

約数の個数: 16

約数和(自身を含む): 23369472

約数和(自身を除く): 3390625

約数列:

[1, 7, 83, 137, 251, 581, 959, 1757, 11371, 20833, 34387, 79597, 145831, 240709, 2854121, 19978847]

約数ペア:

[(1, 19978847), (7, 2854121), (83, 240709), (137, 145831), (251, 79597), (581, 34387), (959, 20833), (1757, 11371)]