21209903

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{1787}}^1$

素因数の和:1894

約数の個数: 16

約数和(自身を含む): 25232256

約数和(自身を除く): 4022353

約数列:

[1, 11, 13, 83, 143, 913, 1079, 1787, 11869, 19657, 23231, 148321, 255541, 1631531, 1928173, 21209903]

約数ペア:

[(1, 21209903), (11, 1928173), (13, 1631531), (83, 255541), (143, 148321), (913, 23231), (1079, 19657), (1787, 11869)]