20506562137 has 16 divisors (see below), whose sum is σ = 21856003200. Its totient is φ = 19173448960.

The previous prime is 20506562119. The next prime is 20506562143. The reversal of 20506562137 is 73126560502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20506562137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20506562096 and 20506562105.

It is not an unprimeable number, because it can be changed into a prime (20506562107) 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, 1635462 + ... + 1647952.

It is an arithmetic number, because the mean of its divisors is an integer number (1366000200).

Almost surely, 2^20506562137 is an apocalyptic number.

It is an amenable number.

20506562137 is a deficient number, since it is larger than the sum of its proper divisors (1349441063).

20506562137 is a wasteful number, since it uses less digits than its factorization.

20506562137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13136.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 20506562137 in words is "twenty billion, five hundred six million, five hundred sixty-two thousand, one hundred thirty-seven".