20837660431 has 4 divisors (see below), whose sum is σ = 23814469072. Its totient is φ = 17860851792.

The previous prime is 20837660429. The next prime is 20837660479. The reversal of 20837660431 is 13406673802.

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

It is not a de Polignac number, because 20837660431 - 2¹ = 20837660429 is a prime.

It is a super-2 number, since 2×20837660431² (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 (20837660731) 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, 1488404310 + ... + 1488404323.

It is an arithmetic number, because the mean of its divisors is an integer number (5953617268).

Almost surely, 2^20837660431 is an apocalyptic number.

20837660431 is a deficient number, since it is larger than the sum of its proper divisors (2976808641).

20837660431 is an equidigital number, since it uses as much as digits as its factorization.

20837660431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976808640.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 20837660431 in words is "twenty billion, eight hundred thirty-seven million, six hundred sixty thousand, four hundred thirty-one".