20555523 has 6 divisors (see below), whose sum is σ = 29691324. Its totient is φ = 13703676.

The previous prime is 20555503. The next prime is 20555527. The reversal of 20555523 is 32555502.

It is not a de Polignac number, because 20555523 - 2¹⁸ = 20293379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1141965 + ... + 1141982.

It is an arithmetic number, because the mean of its divisors is an integer number (4948554).

Almost surely, 2^20555523 is an apocalyptic number.

20555523 is a deficient number, since it is larger than the sum of its proper divisors (9135801).

20555523 is a wasteful number, since it uses less digits than its factorization.

20555523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283953 (or 2283950 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 27.

The square root of 20555523 is about 4533.8199126123. The cubic root of 20555523 is about 273.9320475460.

The spelling of 20555523 in words is "twenty million, five hundred fifty-five thousand, five hundred twenty-three".