21206409

素因数分解:

$3^1\times 7^1\times {\mathrm{991}}^1\times {\mathrm{1019}}^1$

素因数の和:2020

約数の個数: 16

約数和(自身を含む): 32378880

約数和(自身を除く): 11172471

約数列:

[1, 3, 7, 21, 991, 1019, 2973, 3057, 6937, 7133, 20811, 21399, 1009829, 3029487, 7068803, 21206409]

約数ペア:

[(1, 21206409), (3, 7068803), (7, 3029487), (21, 1009829), (991, 21399), (1019, 20811), (2973, 7133), (3057, 6937)]