20256553653 has 16 divisors (see below), whose sum is σ = 30873191040. Its totient is φ = 11572900416.

The previous prime is 20256553633. The next prime is 20256553661. The reversal of 20256553653 is 35635565202.

It is not a de Polignac number, because 20256553653 - 2⁸ = 20256553397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256553633) 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, 17883 + ... + 202071.

It is an arithmetic number, because the mean of its divisors is an integer number (1929574440).

Almost surely, 2^20256553653 is an apocalyptic number.

It is an amenable number.

20256553653 is a deficient number, since it is larger than the sum of its proper divisors (10616637387).

20256553653 is a wasteful number, since it uses less digits than its factorization.

20256553653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189436.

The product of its (nonzero) digits is 810000, while the sum is 42.

The spelling of 20256553653 in words is "twenty billion, two hundred fifty-six million, five hundred fifty-three thousand, six hundred fifty-three".