20500125437 has 4 divisors (see below), whose sum is σ = 22363773216. Its totient is φ = 18636477660.

The previous prime is 20500125409. The next prime is 20500125467. The reversal of 20500125437 is 73452100502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20500125437 - 2¹⁰ = 20500124413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500125467) 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, 931823873 + ... + 931823894.

It is an arithmetic number, because the mean of its divisors is an integer number (5590943304).

Almost surely, 2^20500125437 is an apocalyptic number.

It is an amenable number.

20500125437 is a deficient number, since it is larger than the sum of its proper divisors (1863647779).

20500125437 is a wasteful number, since it uses less digits than its factorization.

20500125437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863647778.

The product of its (nonzero) digits is 8400, while the sum is 29.

Adding to 20500125437 its reverse (73452100502), we get a palindrome (93952225939).

The spelling of 20500125437 in words is "twenty billion, five hundred million, one hundred twenty-five thousand, four hundred thirty-seven".