17781981

素因数分解:

$3^1\times 7^1\times {\mathrm{641}}^1\times {\mathrm{1321}}^1$

素因数の和:1972

約数の個数: 16

約数和(自身を含む): 27159168

約数和(自身を除く): 9377187

約数列:

[1, 3, 7, 21, 641, 1321, 1923, 3963, 4487, 9247, 13461, 27741, 846761, 2540283, 5927327, 17781981]

約数ペア:

[(1, 17781981), (3, 5927327), (7, 2540283), (21, 846761), (641, 27741), (1321, 13461), (1923, 9247), (3963, 4487)]