19921979

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{1607}}^1$

素因数の和:1655

約数の個数: 24

約数和(自身を含む): 26396928

約数和(自身を除く): 6474949

約数列:

[1, 7, 11, 23, 49, 77, 161, 253, 539, 1127, 1607, 1771, 11249, 12397, 17677, 36961, 78743, 123739, 258727, 406571, 866173, 1811089, 2845997, 19921979]

約数ペア:

[(1, 19921979), (7, 2845997), (11, 1811089), (23, 866173), (49, 406571), (77, 258727), (161, 123739), (253, 78743), (539, 36961), (1127, 17677), (1607, 12397), (1771, 11249)]