20542573123890 has 32 divisors (see below), whose sum is σ = 49810445354880. Its totient is φ = 5421545071104.

The previous prime is 20542573123889. The next prime is 20542573123901. The reversal of 20542573123890 is 9832137524502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529648830 + ... + 3529654649.

It is an arithmetic number, because the mean of its divisors is an integer number (1556576417340).

Almost surely, 2^{20542573123890} is an apocalyptic number.

20542573123890 is an abundant number, since it is smaller than the sum of its proper divisors (29267872230990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20542573123890 is a wasteful number, since it uses less digits than its factorization.

20542573123890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7059303586.

The product of its (nonzero) digits is 3628800, while the sum is 51.

The spelling of 20542573123890 in words is "twenty trillion, five hundred forty-two billion, five hundred seventy-three million, one hundred twenty-three thousand, eight hundred ninety".