20942513089 has 4 divisors (see below), whose sum is σ = 22044750640. Its totient is φ = 19840275540.

The previous prime is 20942513087. The next prime is 20942513099. The reversal of 20942513089 is 98031524902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98031524902 = 2 ⋅49015762451.

It is a cyclic number.

It is not a de Polignac number, because 20942513089 - 2¹ = 20942513087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20942513087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551118747 + ... + 551118784.

It is an arithmetic number, because the mean of its divisors is an integer number (5511187660).

Almost surely, 2^20942513089 is an apocalyptic number.

It is an amenable number.

20942513089 is a deficient number, since it is larger than the sum of its proper divisors (1102237551).

20942513089 is a wasteful number, since it uses less digits than its factorization.

20942513089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102237550.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 20942513089 in words is "twenty billion, nine hundred forty-two million, five hundred thirteen thousand, eighty-nine".