21047721

素因数分解:

$3^1\times {\mathrm{83}}^1\times {\mathrm{137}}^1\times {\mathrm{617}}^1$

素因数の和:840

約数の個数: 16

約数和(自身を含む): 28655424

約数和(自身を除く): 7607703

約数列:

[1, 3, 83, 137, 249, 411, 617, 1851, 11371, 34113, 51211, 84529, 153633, 253587, 7015907, 21047721]

約数ペア:

[(1, 21047721), (3, 7015907), (83, 253587), (137, 153633), (249, 84529), (411, 51211), (617, 34113), (1851, 11371)]