19977909

素因数分解:

$3^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{13399}}^1$

素因数の和:13480

約数の個数: 16

約数和(自身を含む): 30873600

約数和(自身を除く): 10895691

約数列:

[1, 3, 7, 21, 71, 213, 497, 1491, 13399, 40197, 93793, 281379, 951329, 2853987, 6659303, 19977909]

約数ペア:

[(1, 19977909), (3, 6659303), (7, 2853987), (21, 951329), (71, 281379), (213, 93793), (497, 40197), (1491, 13399)]