20991978

素因数分解:

$2^1\times 3^2\times 7^1\times {\mathrm{166603}}^1$

素因数の和:166618

約数の個数: 24

約数和(自身を含む): 51980448

約数和(自身を除く): 30988470

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126, 166603, 333206, 499809, 999618, 1166221, 1499427, 2332442, 2998854, 3498663, 6997326, 10495989, 20991978]

約数ペア:

[(1, 20991978), (2, 10495989), (3, 6997326), (6, 3498663), (7, 2998854), (9, 2332442), (14, 1499427), (18, 1166221), (21, 999618), (42, 499809), (63, 333206), (126, 166603)]