20857715089 has 16 divisors (see below), whose sum is σ = 22818571776. Its totient is φ = 18979603200.

The previous prime is 20857715077. The next prime is 20857715093. The reversal of 20857715089 is 98051775802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20857715089 - 2⁵ = 20857715057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20857715009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556819 + ... + 593095.

It is an arithmetic number, because the mean of its divisors is an integer number (1426160736).

Almost surely, 2^20857715089 is an apocalyptic number.

It is an amenable number.

20857715089 is a deficient number, since it is larger than the sum of its proper divisors (1960856687).

20857715089 is a wasteful number, since it uses less digits than its factorization.

20857715089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37416.

The product of its (nonzero) digits is 1411200, while the sum is 52.

The spelling of 20857715089 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, eighty-nine".