12720640

素因数分解:

$2^9\times 5^1\times {\mathrm{4969}}^1$

素因数の和:4992

約数の個数: 40

約数和(自身を含む): 30505860

約数和(自身を除く): 17785220

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 4969, 9938, 19876, 24845, 39752, 49690, 79504, 99380, 159008, 198760, 318016, 397520, 636032, 795040, 1272064, 1590080, 2544128, 3180160, 6360320, 12720640]

約数ペア:

[(1, 12720640), (2, 6360320), (4, 3180160), (5, 2544128), (8, 1590080), (10, 1272064), (16, 795040), (20, 636032), (32, 397520), (40, 318016), (64, 198760), (80, 159008), (128, 99380), (160, 79504), (256, 49690), (320, 39752), (512, 24845), (640, 19876), (1280, 9938), (2560, 4969)]