20458991

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{199}}^1\times {\mathrm{773}}^1$

素因数の和:998

約数の個数: 16

約数和(自身を含む): 24768000

約数和(自身を除く): 4309009

約数列:

[1, 7, 19, 133, 199, 773, 1393, 3781, 5411, 14687, 26467, 102809, 153827, 1076789, 2922713, 20458991]

約数ペア:

[(1, 20458991), (7, 2922713), (19, 1076789), (133, 153827), (199, 102809), (773, 26467), (1393, 14687), (3781, 5411)]