19901105

素因数分解:

$5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{2801}}^1$

素因数の和:2849

約数の個数: 24

約数和(自身を含む): 28748520

約数和(自身を除く): 8847415

約数列:

[1, 5, 7, 29, 35, 49, 145, 203, 245, 1015, 1421, 2801, 7105, 14005, 19607, 81229, 98035, 137249, 406145, 568603, 686245, 2843015, 3980221, 19901105]

約数ペア:

[(1, 19901105), (5, 3980221), (7, 2843015), (29, 686245), (35, 568603), (49, 406145), (145, 137249), (203, 98035), (245, 81229), (1015, 19607), (1421, 14005), (2801, 7105)]