20989563

素因数分解:

$3^1\times 7^1\times {\mathrm{191}}^1\times {\mathrm{5233}}^1$

素因数の和:5434

約数の個数: 16

約数和(自身を含む): 32157696

約数和(自身を除く): 11168133

約数列:

[1, 3, 7, 21, 191, 573, 1337, 4011, 5233, 15699, 36631, 109893, 999503, 2998509, 6996521, 20989563]

約数ペア:

[(1, 20989563), (3, 6996521), (7, 2998509), (21, 999503), (191, 109893), (573, 36631), (1337, 15699), (4011, 5233)]