20055523 has 4 divisors (see below), whose sum is σ = 20073528. Its totient is φ = 20037520.

The previous prime is 20055491. The next prime is 20055547. The reversal of 20055523 is 32555002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32555002 = 2 ⋅16277501.

It is a cyclic number.

It is not a de Polignac number, because 20055523 - 2⁵ = 20055491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20055494 and 20055503.

It is not an unprimeable number, because it can be changed into a prime (20055593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7213 + ... + 9598.

It is an arithmetic number, because the mean of its divisors is an integer number (5018382).

Almost surely, 2^20055523 is an apocalyptic number.

20055523 is a deficient number, since it is larger than the sum of its proper divisors (18005).

20055523 is a wasteful number, since it uses less digits than its factorization.

20055523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18004.

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 20055523 is about 4478.3393127364. The cubic root of 20055523 is about 271.6927172546.

The spelling of 20055523 in words is "twenty million, fifty-five thousand, five hundred twenty-three".