21040640

素因数分解:

$2^9\times 5^1\times {\mathrm{8219}}^1$

素因数の和:8242

約数の個数: 40

約数和(自身を含む): 50454360

約数和(自身を除く): 29413720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8219, 16438, 32876, 41095, 65752, 82190, 131504, 164380, 263008, 328760, 526016, 657520, 1052032, 1315040, 2104064, 2630080, 4208128, 5260160, 10520320, 21040640]

約数ペア:

[(1, 21040640), (2, 10520320), (4, 5260160), (5, 4208128), (8, 2630080), (10, 2104064), (16, 1315040), (20, 1052032), (32, 657520), (40, 526016), (64, 328760), (80, 263008), (128, 164380), (160, 131504), (256, 82190), (320, 65752), (512, 41095), (640, 32876), (1280, 16438), (2560, 8219)]