20056551 has 4 divisors (see below), whose sum is σ = 26742072. Its totient is φ = 13371032.

The previous prime is 20056523. The next prime is 20056559. The reversal of 20056551 is 15565002.

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 20056551 - 2⁷ = 20056423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20056559) 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, 3342756 + ... + 3342761.

It is an arithmetic number, because the mean of its divisors is an integer number (6685518).

Almost surely, 2^20056551 is an apocalyptic number.

20056551 is a deficient number, since it is larger than the sum of its proper divisors (6685521).

20056551 is an equidigital number, since it uses as much as digits as its factorization.

20056551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685520.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 20056551 is about 4478.4540859542. The cubic root of 20056551 is about 271.6973592900.

The spelling of 20056551 in words is "twenty million, fifty-six thousand, five hundred fifty-one".