20493842637 has 4 divisors (see below), whose sum is σ = 27325123520. Its totient is φ = 13662561756.

The previous prime is 20493842627. The next prime is 20493842647. The reversal of 20493842637 is 73624839402.

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 an interprime number because it is at equal distance from previous prime (20493842627) and next prime (20493842647).

It is not a de Polignac number, because 20493842637 - 2³⁰ = 19420100813 is a prime.

It is a super-2 number, since 2×20493842637² (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 (20493842627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3415640437 + ... + 3415640442.

It is an arithmetic number, because the mean of its divisors is an integer number (6831280880).

Almost surely, 2^20493842637 is an apocalyptic number.

It is an amenable number.

20493842637 is a deficient number, since it is larger than the sum of its proper divisors (6831280883).

20493842637 is an equidigital number, since it uses as much as digits as its factorization.

20493842637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6831280882.

The product of its (nonzero) digits is 1741824, while the sum is 48.

The spelling of 20493842637 in words is "twenty billion, four hundred ninety-three million, eight hundred forty-two thousand, six hundred thirty-seven".