21143120

素因数分解:

$2^4\times 5^1\times {\mathrm{264289}}^1$

素因数の和:264302

約数の個数: 20

約数和(自身を含む): 49157940

約数和(自身を除く): 28014820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264289, 528578, 1057156, 1321445, 2114312, 2642890, 4228624, 5285780, 10571560, 21143120]

約数ペア:

[(1, 21143120), (2, 10571560), (4, 5285780), (5, 4228624), (8, 2642890), (10, 2114312), (16, 1321445), (20, 1057156), (40, 528578), (80, 264289)]