19978305

素因数分解:

$3^1\times 5^1\times {\mathrm{101}}^1\times {\mathrm{13187}}^1$

素因数の和:13296

約数の個数: 16

約数和(自身を含む): 32284224

約数和(自身を除く): 12305919

約数列:

[1, 3, 5, 15, 101, 303, 505, 1515, 13187, 39561, 65935, 197805, 1331887, 3995661, 6659435, 19978305]

約数ペア:

[(1, 19978305), (3, 6659435), (5, 3995661), (15, 1331887), (101, 197805), (303, 65935), (505, 39561), (1515, 13187)]