20052551 has 4 divisors (see below), whose sum is σ = 20294232. Its totient is φ = 19810872.

The previous prime is 20052541. The next prime is 20052559. The reversal of 20052551 is 15525002.

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 20052551 - 2¹⁰ = 20051527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20052559) 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, 120716 + ... + 120881.

It is an arithmetic number, because the mean of its divisors is an integer number (5073558).

Almost surely, 2^20052551 is an apocalyptic number.

20052551 is a deficient number, since it is larger than the sum of its proper divisors (241681).

20052551 is an equidigital number, since it uses as much as digits as its factorization.

20052551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241680.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20052551 is about 4478.0074810121. The cubic root of 20052551 is about 271.6792960033.

Adding to 20052551 its reverse (15525002), we get a palindrome (35577553).

The spelling of 20052551 in words is "twenty million, fifty-two thousand, five hundred fifty-one".