19811320

素因数分解:

$2^3\times 5^1\times {\mathrm{223}}^1\times {\mathrm{2221}}^1$

素因数の和:2455

約数の個数: 32

約数和(自身を含む): 44795520

約数和(自身を除く): 24984200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 223, 446, 892, 1115, 1784, 2221, 2230, 4442, 4460, 8884, 8920, 11105, 17768, 22210, 44420, 88840, 495283, 990566, 1981132, 2476415, 3962264, 4952830, 9905660, 19811320]

約数ペア:

[(1, 19811320), (2, 9905660), (4, 4952830), (5, 3962264), (8, 2476415), (10, 1981132), (20, 990566), (40, 495283), (223, 88840), (446, 44420), (892, 22210), (1115, 17768), (1784, 11105), (2221, 8920), (2230, 8884), (4442, 4460)]