21405769

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{2699}}^1$

素因数の和:2820

約数の個数: 16

約数和(自身を含む): 26956800

約数和(自身を除く): 5551031

約数列:

[1, 7, 11, 77, 103, 721, 1133, 2699, 7931, 18893, 29689, 207823, 277997, 1945979, 3057967, 21405769]

約数ペア:

[(1, 21405769), (7, 3057967), (11, 1945979), (77, 277997), (103, 207823), (721, 29689), (1133, 18893), (2699, 7931)]