19978407

素因数分解:

$3^4\times {\mathrm{157}}^1\times {\mathrm{1571}}^1$

素因数の和:1740

約数の個数: 20

約数和(自身を含む): 30053496

約数和(自身を除く): 10075089

約数列:

[1, 3, 9, 27, 81, 157, 471, 1413, 1571, 4239, 4713, 12717, 14139, 42417, 127251, 246647, 739941, 2219823, 6659469, 19978407]

約数ペア:

[(1, 19978407), (3, 6659469), (9, 2219823), (27, 739941), (81, 246647), (157, 127251), (471, 42417), (1413, 14139), (1571, 12717), (4239, 4713)]