20553123 has 8 divisors (see below), whose sum is σ = 27504208. Its totient is φ = 13652064.

The previous prime is 20553107. The next prime is 20553133. The reversal of 20553123 is 32135502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20553123 - 2⁴ = 20553107 is a prime.

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 20553123.

It is not an unprimeable number, because it can be changed into a prime (20553133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11536 + ... + 13197.

It is an arithmetic number, because the mean of its divisors is an integer number (3438026).

Almost surely, 2^20553123 is an apocalyptic number.

20553123 is a deficient number, since it is larger than the sum of its proper divisors (6951085).

20553123 is a wasteful number, since it uses less digits than its factorization.

20553123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25013.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20553123 is about 4533.5552274126. Note that the first 3 decimals coincide. The cubic root of 20553123 is about 273.9213859751.

Adding to 20553123 its reverse (32135502), we get a palindrome (52688625).

The spelling of 20553123 in words is "twenty million, five hundred fifty-three thousand, one hundred twenty-three".