20534493 has 16 divisors (see below), whose sum is σ = 32301056. Its totient is φ = 11355120.

The previous prime is 20534489. The next prime is 20534531. The reversal of 20534493 is 39443502.

It is not a de Polignac number, because 20534493 - 2² = 20534489 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 4532-nd Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20534493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534413) by changing a digit.

It is a nontrivial repunit in base 4531.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15121 + ... + 16422.

It is an arithmetic number, because the mean of its divisors is an integer number (2018816).

Almost surely, 2^20534493 is an apocalyptic number.

It is an amenable number.

20534493 is a deficient number, since it is larger than the sum of its proper divisors (11766563).

20534493 is a wasteful number, since it uses less digits than its factorization.

20534493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31584.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20534493 is about 4531.5000827541. The cubic root of 20534493 is about 273.8385972899.

Adding to 20534493 its reverse (39443502), we get a palindrome (59977995).

The spelling of 20534493 in words is "twenty million, five hundred thirty-four thousand, four hundred ninety-three".