21208761

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{7829}}^1$

素因数の和:7885

約数の個数: 24

約数和(自身を含む): 35830080

約数和(自身を除く): 14621319

約数列:

[1, 3, 7, 9, 21, 43, 63, 129, 301, 387, 903, 2709, 7829, 23487, 54803, 70461, 164409, 336647, 493227, 1009941, 2356529, 3029823, 7069587, 21208761]

約数ペア:

[(1, 21208761), (3, 7069587), (7, 3029823), (9, 2356529), (21, 1009941), (43, 493227), (63, 336647), (129, 164409), (301, 70461), (387, 54803), (903, 23487), (2709, 7829)]