20534473 has 4 divisors (see below), whose sum is σ = 20716308. Its totient is φ = 20352640.

The previous prime is 20534471. The next prime is 20534489. The reversal of 20534473 is 37443502.

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 1411344 + 19123129 = 1188^2 + 4373^2 .

It is a cyclic number.

It is not a de Polignac number, because 20534473 - 2¹ = 20534471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20534471) 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, 90748 + ... + 90973.

It is an arithmetic number, because the mean of its divisors is an integer number (5179077).

Almost surely, 2^20534473 is an apocalyptic number.

It is an amenable number.

20534473 is a deficient number, since it is larger than the sum of its proper divisors (181835).

20534473 is a wasteful number, since it uses less digits than its factorization.

20534473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181834.

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 20534473 is about 4531.4978759788. The cubic root of 20534473 is about 273.8385083863.

Adding to 20534473 its reverse (37443502), we get a palindrome (57977975).

The spelling of 20534473 in words is "twenty million, five hundred thirty-four thousand, four hundred seventy-three".