21388455

素因数分解:

$3^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{4801}}^1$

素因数の和:4829

約数の個数: 40

約数和(自身を含む): 41835024

約数和(自身を除く): 20446569

約数列:

[1, 3, 5, 9, 11, 15, 27, 33, 45, 55, 81, 99, 135, 165, 297, 405, 495, 891, 1485, 4455, 4801, 14403, 24005, 43209, 52811, 72015, 129627, 158433, 216045, 264055, 388881, 475299, 648135, 792165, 1425897, 1944405, 2376495, 4277691, 7129485, 21388455]

約数ペア:

[(1, 21388455), (3, 7129485), (5, 4277691), (9, 2376495), (11, 1944405), (15, 1425897), (27, 792165), (33, 648135), (45, 475299), (55, 388881), (81, 264055), (99, 216045), (135, 158433), (165, 129627), (297, 72015), (405, 52811), (495, 43209), (891, 24005), (1485, 14403), (4455, 4801)]