20045534 has 4 divisors (see below), whose sum is σ = 30068304. Its totient is φ = 10022766.

The previous prime is 20045521. The next prime is 20045537. The reversal of 20045534 is 43554002.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5011382 + ... + 5011385.

It is an arithmetic number, because the mean of its divisors is an integer number (7517076).

Almost surely, 2^20045534 is an apocalyptic number.

20045534 is a deficient number, since it is larger than the sum of its proper divisors (10022770).

20045534 is a wasteful number, since it uses less digits than its factorization.

20045534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10022769.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20045534 is about 4477.2239166698. The cubic root of 20045534 is about 271.6476026786.

Adding to 20045534 its reverse (43554002), we get a palindrome (63599536).

The spelling of 20045534 in words is "twenty million, forty-five thousand, five hundred thirty-four".