21278745

素因数分解:

$3^2\times 5^1\times {\mathrm{509}}^1\times {\mathrm{929}}^1$

素因数の和:1449

約数の個数: 24

約数和(自身を含む): 36995400

約数和(自身を除く): 15716655

約数列:

[1, 3, 5, 9, 15, 45, 509, 929, 1527, 2545, 2787, 4581, 4645, 7635, 8361, 13935, 22905, 41805, 472861, 1418583, 2364305, 4255749, 7092915, 21278745]

約数ペア:

[(1, 21278745), (3, 7092915), (5, 4255749), (9, 2364305), (15, 1418583), (45, 472861), (509, 41805), (929, 22905), (1527, 13935), (2545, 8361), (2787, 7635), (4581, 4645)]