19987903

素因数分解:

${\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{149}}^1\times {\mathrm{607}}^1$

素因数の和:786

約数の個数: 16

約数和(自身を含む): 22982400

約数和(自身を除く): 2994497

約数列:

[1, 13, 17, 149, 221, 607, 1937, 2533, 7891, 10319, 32929, 90443, 134147, 1175759, 1537531, 19987903]

約数ペア:

[(1, 19987903), (13, 1537531), (17, 1175759), (149, 134147), (221, 90443), (607, 32929), (1937, 10319), (2533, 7891)]