20981120

素因数分解:

$2^7\times 5^1\times {\mathrm{32783}}^1$

素因数の和:32802

約数の個数: 32

約数和(自身を含む): 50159520

約数和(自身を除く): 29178400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 32783, 65566, 131132, 163915, 262264, 327830, 524528, 655660, 1049056, 1311320, 2098112, 2622640, 4196224, 5245280, 10490560, 20981120]

約数ペア:

[(1, 20981120), (2, 10490560), (4, 5245280), (5, 4196224), (8, 2622640), (10, 2098112), (16, 1311320), (20, 1049056), (32, 655660), (40, 524528), (64, 327830), (80, 262264), (128, 163915), (160, 131132), (320, 65566), (640, 32783)]