21251839

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{109}}^1\times {\mathrm{173}}^1$

素因数の和:319

約数の個数: 24

約数和(自身を含む): 26183520

約数和(自身を除く): 4931681

約数列:

[1, 7, 23, 49, 109, 161, 173, 763, 1127, 1211, 2507, 3979, 5341, 8477, 17549, 18857, 27853, 122843, 131999, 194971, 433711, 923993, 3035977, 21251839]

約数ペア:

[(1, 21251839), (7, 3035977), (23, 923993), (49, 433711), (109, 194971), (161, 131999), (173, 122843), (763, 27853), (1127, 18857), (1211, 17549), (2507, 8477), (3979, 5341)]