19978231

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{397}}^1$

素因数の和:503

約数の個数: 24

約数和(自身を含む): 25408320

約数和(自身を除く): 5430089

約数列:

[1, 7, 13, 49, 79, 91, 397, 553, 637, 1027, 2779, 3871, 5161, 7189, 19453, 31363, 36127, 50323, 219541, 252889, 407719, 1536787, 2854033, 19978231]

約数ペア:

[(1, 19978231), (7, 2854033), (13, 1536787), (49, 407719), (79, 252889), (91, 219541), (397, 50323), (553, 36127), (637, 31363), (1027, 19453), (2779, 7189), (3871, 5161)]