21509379

素因数分解:

$3^2\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{821}}^1$

素因数の和:939

約数の個数: 24

約数和(自身を含む): 32314464

約数和(自身を除く): 10805085

約数列:

[1, 3, 9, 41, 71, 123, 213, 369, 639, 821, 2463, 2911, 7389, 8733, 26199, 33661, 58291, 100983, 174873, 302949, 524619, 2389931, 7169793, 21509379]

約数ペア:

[(1, 21509379), (3, 7169793), (9, 2389931), (41, 524619), (71, 302949), (123, 174873), (213, 100983), (369, 58291), (639, 33661), (821, 26199), (2463, 8733), (2911, 7389)]