20553113531 has 4 divisors (see below), whose sum is σ = 20650521864. Its totient is φ = 20455705200.

The previous prime is 20553113519. The next prime is 20553113533. The reversal of 20553113531 is 13531135502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20553113531 - 2²² = 20548919227 is a prime.

It is a super-2 number, since 2×20553113531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20553113494 and 20553113503.

It is not an unprimeable number, because it can be changed into a prime (20553113533) 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, 48703850 + ... + 48704271.

It is an arithmetic number, because the mean of its divisors is an integer number (5162630466).

Almost surely, 2^20553113531 is an apocalyptic number.

20553113531 is a deficient number, since it is larger than the sum of its proper divisors (97408333).

20553113531 is an equidigital number, since it uses as much as digits as its factorization.

20553113531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97408332.

The product of its (nonzero) digits is 6750, while the sum is 29.

The spelling of 20553113531 in words is "twenty billion, five hundred fifty-three million, one hundred thirteen thousand, five hundred thirty-one".