20128037 has 4 divisors (see below), whose sum is σ = 20672076. Its totient is φ = 19584000.

The previous prime is 20128033. The next prime is 20128061. The reversal of 20128037 is 73082102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14145121 + 5982916 = 3761^2 + 2446^2 .

It is a cyclic number.

It is not a de Polignac number, because 20128037 - 2² = 20128033 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 (20128033) 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, 271964 + ... + 272037.

It is an arithmetic number, because the mean of its divisors is an integer number (5168019).

Almost surely, 2^20128037 is an apocalyptic number.

It is an amenable number.

20128037 is a deficient number, since it is larger than the sum of its proper divisors (544039).

20128037 is an equidigital number, since it uses as much as digits as its factorization.

20128037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544038.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20128037 is about 4486.4280892487. The cubic root of 20128037 is about 272.0197731084.

The spelling of 20128037 in words is "twenty million, one hundred twenty-eight thousand, thirty-seven".