20538513837 has 12 divisors (see below), whose sum is σ = 30226492764. Its totient is φ = 13433996160.

The previous prime is 20538513823. The next prime is 20538513859. The reversal of 20538513837 is 73831583502.

20538513837 is a `hidden beast` number, since 2 + 0 + 53 + 8 + 513 + 83 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6280721001 + 14257792836 = 79251^2 + 119406^2 .

It is not a de Polignac number, because 20538513837 - 2¹⁸ = 20538251693 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20538513792 and 20538513801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538513887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21528364 + ... + 21529317.

It is an arithmetic number, because the mean of its divisors is an integer number (2518874397).

Almost surely, 2^20538513837 is an apocalyptic number.

It is an amenable number.

20538513837 is a deficient number, since it is larger than the sum of its proper divisors (9687978927).

20538513837 is a wasteful number, since it uses less digits than its factorization.

20538513837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43057740 (or 43057737 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20538513837 in words is "twenty billion, five hundred thirty-eight million, five hundred thirteen thousand, eight hundred thirty-seven".