20389937 has 4 divisors (see below), whose sum is σ = 21276480. Its totient is φ = 19503396.

The previous prime is 20389927. The next prime is 20389951. The reversal of 20389937 is 73998302.

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 20389937 - 2¹⁴ = 20373553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20389894 and 20389903.

It is not an unprimeable number, because it can be changed into a prime (20389927) 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, 443237 + ... + 443282.

It is an arithmetic number, because the mean of its divisors is an integer number (5319120).

Almost surely, 2^20389937 is an apocalyptic number.

It is an amenable number.

20389937 is a deficient number, since it is larger than the sum of its proper divisors (886543).

20389937 is an equidigital number, since it uses as much as digits as its factorization.

20389937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886542.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20389937 is about 4515.5217860176. The cubic root of 20389937 is about 273.1945059765.

The spelling of 20389937 in words is "twenty million, three hundred eighty-nine thousand, nine hundred thirty-seven".