18708440

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1\times {\mathrm{149}}^1$

素因数の和:276

約数の個数: 64

約数和(自身を含む): 43956000

約数和(自身を除く): 25247560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 73, 86, 146, 149, 172, 215, 292, 298, 344, 365, 430, 584, 596, 730, 745, 860, 1192, 1460, 1490, 1720, 2920, 2980, 3139, 5960, 6278, 6407, 10877, 12556, 12814, 15695, 21754, 25112, 25628, 31390, 32035, 43508, 51256, 54385, 62780, 64070, 87016, 108770, 125560, 128140, 217540, 256280, 435080, 467711, 935422, 1870844, 2338555, 3741688, 4677110, 9354220, 18708440]

約数ペア:

[(1, 18708440), (2, 9354220), (4, 4677110), (5, 3741688), (8, 2338555), (10, 1870844), (20, 935422), (40, 467711), (43, 435080), (73, 256280), (86, 217540), (146, 128140), (149, 125560), (172, 108770), (215, 87016), (292, 64070), (298, 62780), (344, 54385), (365, 51256), (430, 43508), (584, 32035), (596, 31390), (730, 25628), (745, 25112), (860, 21754), (1192, 15695), (1460, 12814), (1490, 12556), (1720, 10877), (2920, 6407), (2980, 6278), (3139, 5960)]