21721235

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{3259}}^1$

素因数の和:3338

約数の個数: 16

約数和(自身を含む): 27540480

約数和(自身を除く): 5819245

約数列:

[1, 5, 31, 43, 155, 215, 1333, 3259, 6665, 16295, 101029, 140137, 505145, 700685, 4344247, 21721235]

約数ペア:

[(1, 21721235), (5, 4344247), (31, 700685), (43, 505145), (155, 140137), (215, 101029), (1333, 16295), (3259, 6665)]