21499960

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{199}}^1$

素因数の和:320

約数の個数: 64

約数和(自身を含む): 50616000

約数和(自身を除く): 29116040

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 73, 74, 146, 148, 185, 199, 292, 296, 365, 370, 398, 584, 730, 740, 796, 995, 1460, 1480, 1592, 1990, 2701, 2920, 3980, 5402, 7363, 7960, 10804, 13505, 14527, 14726, 21608, 27010, 29054, 29452, 36815, 54020, 58108, 58904, 72635, 73630, 108040, 116216, 145270, 147260, 290540, 294520, 537499, 581080, 1074998, 2149996, 2687495, 4299992, 5374990, 10749980, 21499960]

約数ペア:

[(1, 21499960), (2, 10749980), (4, 5374990), (5, 4299992), (8, 2687495), (10, 2149996), (20, 1074998), (37, 581080), (40, 537499), (73, 294520), (74, 290540), (146, 147260), (148, 145270), (185, 116216), (199, 108040), (292, 73630), (296, 72635), (365, 58904), (370, 58108), (398, 54020), (584, 36815), (730, 29452), (740, 29054), (796, 27010), (995, 21608), (1460, 14726), (1480, 14527), (1592, 13505), (1990, 10804), (2701, 7960), (2920, 7363), (3980, 5402)]