19781993

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{1291}}^1$

素因数の和:1508

約数の個数: 16

約数和(自身を含む): 24806400

約数和(自身を除く): 5024407

約数列:

[1, 7, 11, 77, 199, 1291, 1393, 2189, 9037, 14201, 15323, 99407, 256909, 1798363, 2825999, 19781993]

約数ペア:

[(1, 19781993), (7, 2825999), (11, 1798363), (77, 256909), (199, 99407), (1291, 15323), (1393, 14201), (2189, 9037)]