638720

素因数分解:

$2^8\times 5^1\times {\mathrm{499}}^1$

素因数の和:520

約数の個数: 36

約数和(自身を含む): 1533000

約数和(自身を除く): 894280

約数列:

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

約数ペア:

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