20544623 has 4 divisors (see below), whose sum is σ = 22412328. Its totient is φ = 18676920.

The previous prime is 20544611. The next prime is 20544659. The reversal of 20544623 is 32644502.

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

It is a cyclic number.

It is not a de Polignac number, because 20544623 - 2¹⁶ = 20479087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20544592 and 20544601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20544023) 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, 933836 + ... + 933857.

It is an arithmetic number, because the mean of its divisors is an integer number (5603082).

Almost surely, 2^20544623 is an apocalyptic number.

20544623 is a deficient number, since it is larger than the sum of its proper divisors (1867705).

20544623 is a wasteful number, since it uses less digits than its factorization.

20544623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867704.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20544623 is about 4532.6176763544. The cubic root of 20544623 is about 273.8836195681.

The spelling of 20544623 in words is "twenty million, five hundred forty-four thousand, six hundred twenty-three".