18991313

素因数分解:

${\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{83}}^1$

素因数の和:197

約数の個数: 24

約数和(自身を含む): 22165248

約数和(自身を除く): 3173935

約数列:

[1, 11, 31, 61, 83, 121, 341, 671, 913, 1891, 2573, 3751, 5063, 7381, 10043, 20801, 28303, 55693, 156953, 228811, 311333, 612623, 1726483, 18991313]

約数ペア:

[(1, 18991313), (11, 1726483), (31, 612623), (61, 311333), (83, 228811), (121, 156953), (341, 55693), (671, 28303), (913, 20801), (1891, 10043), (2573, 7381), (3751, 5063)]