20465237 has 4 divisors (see below), whose sum is σ = 22039500. Its totient is φ = 18890976.

The previous prime is 20465233. The next prime is 20465243. The reversal of 20465237 is 73256402.

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 9449476 + 11015761 = 3074^2 + 3319^2 .

It is not a de Polignac number, because 20465237 - 2² = 20465233 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 (20465233) 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, 787112 + ... + 787137.

It is an arithmetic number, because the mean of its divisors is an integer number (5509875).

Almost surely, 2^20465237 is an apocalyptic number.

It is an amenable number.

20465237 is a deficient number, since it is larger than the sum of its proper divisors (1574263).

20465237 is a wasteful number, since it uses less digits than its factorization.

20465237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574262.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20465237 is about 4523.8520090737. The cubic root of 20465237 is about 273.5303951060.

It can be divided in two parts, 20465 and 237, that added together give a palindrome (20702).

The spelling of 20465237 in words is "twenty million, four hundred sixty-five thousand, two hundred thirty-seven".