21978593

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{10501}}^1$

素因数の和:10544

約数の個数: 16

約数和(自身を含む): 28229376

約数和(自身を除く): 6250783

約数列:

[1, 7, 13, 23, 91, 161, 299, 2093, 10501, 73507, 136513, 241523, 955591, 1690661, 3139799, 21978593]

約数ペア:

[(1, 21978593), (7, 3139799), (13, 1690661), (23, 955591), (91, 241523), (161, 136513), (299, 73507), (2093, 10501)]