21567721

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{109}}^1\times {\mathrm{1229}}^1$

素因数の和:1368

約数の個数: 16

約数和(自身を含む): 25977600

約数和(自身を除く): 4409879

約数列:

[1, 7, 23, 109, 161, 763, 1229, 2507, 8603, 17549, 28267, 133961, 197869, 937727, 3081103, 21567721]

約数ペア:

[(1, 21567721), (7, 3081103), (23, 937727), (109, 197869), (161, 133961), (763, 28267), (1229, 17549), (2507, 8603)]