20278840

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8311}}^1$

素因数の和:8383

約数の個数: 32

約数和(自身を含む): 46380960

約数和(自身を除く): 26102120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8311, 16622, 33244, 41555, 66488, 83110, 166220, 332440, 506971, 1013942, 2027884, 2534855, 4055768, 5069710, 10139420, 20278840]

約数ペア:

[(1, 20278840), (2, 10139420), (4, 5069710), (5, 4055768), (8, 2534855), (10, 2027884), (20, 1013942), (40, 506971), (61, 332440), (122, 166220), (244, 83110), (305, 66488), (488, 41555), (610, 33244), (1220, 16622), (2440, 8311)]