20923149065 has 16 divisors (see below), whose sum is σ = 30901882368. Its totient is φ = 13243663296.

The previous prime is 20923149061. The next prime is 20923149067. The reversal of 20923149065 is 56094132902.

It is a cyclic number.

It is not a de Polignac number, because 20923149065 - 2² = 20923149061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20923149061) 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, 22992017 + ... + 22992926.

It is an arithmetic number, because the mean of its divisors is an integer number (1931367648).

Almost surely, 2^20923149065 is an apocalyptic number.

It is an amenable number.

20923149065 is a deficient number, since it is larger than the sum of its proper divisors (9978733303).

20923149065 is a wasteful number, since it uses less digits than its factorization.

20923149065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45984968.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 20923149065 in words is "twenty billion, nine hundred twenty-three million, one hundred forty-nine thousand, sixty-five".