20206637431 has 4 divisors (see below), whose sum is σ = 20208969000. Its totient is φ = 20204305864.

The previous prime is 20206637413. The next prime is 20206637449. The reversal of 20206637431 is 13473660202.

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

It is an interprime number because it is at equal distance from previous prime (20206637413) and next prime (20206637449).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20206637431 is a prime.

It is a super-2 number, since 2×20206637431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206637491) 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, 1152736 + ... + 1170133.

It is an arithmetic number, because the mean of its divisors is an integer number (5052242250).

Almost surely, 2^20206637431 is an apocalyptic number.

20206637431 is a deficient number, since it is larger than the sum of its proper divisors (2331569).

20206637431 is an equidigital number, since it uses as much as digits as its factorization.

20206637431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331568.

The product of its (nonzero) digits is 36288, while the sum is 34.

The spelling of 20206637431 in words is "twenty billion, two hundred six million, six hundred thirty-seven thousand, four hundred thirty-one".