21561281

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{157}}^1\times {\mathrm{853}}^1$

素因数の和:1040

約数の個数: 16

約数和(自身を含む): 25906944

約数和(自身を除く): 4345663

約数列:

[1, 7, 23, 157, 161, 853, 1099, 3611, 5971, 19619, 25277, 133921, 137333, 937447, 3080183, 21561281]

約数ペア:

[(1, 21561281), (7, 3080183), (23, 937447), (157, 137333), (161, 133921), (853, 25277), (1099, 19619), (3611, 5971)]