20319937 has 4 divisors (see below), whose sum is σ = 22167216. Its totient is φ = 18472660.

The previous prime is 20319931. The next prime is 20319989. The reversal of 20319937 is 73991302.

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 not a de Polignac number, because 20319937 - 2⁷ = 20319809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20319931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923623 + ... + 923644.

It is an arithmetic number, because the mean of its divisors is an integer number (5541804).

Almost surely, 2^20319937 is an apocalyptic number.

It is an amenable number.

20319937 is a deficient number, since it is larger than the sum of its proper divisors (1847279).

20319937 is a wasteful number, since it uses less digits than its factorization.

20319937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847278.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 20319937 is about 4507.7640798959. The cubic root of 20319937 is about 272.8815159386.

The spelling of 20319937 in words is "twenty million, three hundred nineteen thousand, nine hundred thirty-seven".