1277440

素因数分解:

$2^9\times 5^1\times {\mathrm{499}}^1$

素因数の和:522

約数の個数: 40

約数和(自身を含む): 3069000

約数和(自身を除く): 1791560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 499, 512, 640, 998, 1280, 1996, 2495, 2560, 3992, 4990, 7984, 9980, 15968, 19960, 31936, 39920, 63872, 79840, 127744, 159680, 255488, 319360, 638720, 1277440]

約数ペア:

[(1, 1277440), (2, 638720), (4, 319360), (5, 255488), (8, 159680), (10, 127744), (16, 79840), (20, 63872), (32, 39920), (40, 31936), (64, 19960), (80, 15968), (128, 9980), (160, 7984), (256, 4990), (320, 3992), (499, 2560), (512, 2495), (640, 1996), (998, 1280)]