20393948437 has 4 divisors (see below), whose sum is σ = 20739608640. Its totient is φ = 20048288236.

The previous prime is 20393948401. The next prime is 20393948479. The reversal of 20393948437 is 73484939302.

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 a de Polignac number, because none of the positive numbers 2^k-20393948437 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 (20393948137) 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, 172830013 + ... + 172830130.

It is an arithmetic number, because the mean of its divisors is an integer number (5184902160).

Almost surely, 2^20393948437 is an apocalyptic number.

It is an amenable number.

20393948437 is a deficient number, since it is larger than the sum of its proper divisors (345660203).

20393948437 is an equidigital number, since it uses as much as digits as its factorization.

20393948437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345660202.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 20393948437 in words is "twenty billion, three hundred ninety-three million, nine hundred forty-eight thousand, four hundred thirty-seven".