1640960

素因数分解:

$2^9\times 5^1\times {\mathrm{641}}^1$

素因数の和:664

約数の個数: 40

約数和(自身を含む): 3940596

約数和(自身を除く): 2299636

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 641, 1280, 1282, 2560, 2564, 3205, 5128, 6410, 10256, 12820, 20512, 25640, 41024, 51280, 82048, 102560, 164096, 205120, 328192, 410240, 820480, 1640960]

約数ペア:

[(1, 1640960), (2, 820480), (4, 410240), (5, 328192), (8, 205120), (10, 164096), (16, 102560), (20, 82048), (32, 51280), (40, 41024), (64, 25640), (80, 20512), (128, 12820), (160, 10256), (256, 6410), (320, 5128), (512, 3205), (640, 2564), (641, 2560), (1280, 1282)]