20553144325 has 18 divisors (see below), whose sum is σ = 29646863826. Its totient is φ = 14093583840.

The previous prime is 20553144259. The next prime is 20553144413. The reversal of 20553144325 is 52344135502.

It can be written as a sum of positive squares in 3 ways, for example, as 1154504484 + 19398639841 = 33978^2 + 139279^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20553144325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8387814 + ... + 8390263.

Almost surely, 2^20553144325 is an apocalyptic number.

20553144325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20553144325 is a deficient number, since it is larger than the sum of its proper divisors (9093719501).

20553144325 is a wasteful number, since it uses less digits than its factorization.

20553144325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16778101 (or 16778089 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 20553144325 its reverse (52344135502), we get a palindrome (72897279827).

The spelling of 20553144325 in words is "twenty billion, five hundred fifty-three million, one hundred forty-four thousand, three hundred twenty-five".