20552331 has 8 divisors (see below), whose sum is σ = 27457600. Its totient is φ = 13674312.

The previous prime is 20552291. The next prime is 20552333. The reversal of 20552331 is 13325502.

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

It is not a de Polignac number, because 20552331 - 2⁹ = 20551819 is a prime.

It is a super-2 number, since 2×20552331² = 844796619067122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20552298 and 20552307.

It is not an unprimeable number, because it can be changed into a prime (20552333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4981 + ... + 8118.

It is an arithmetic number, because the mean of its divisors is an integer number (3432200).

Almost surely, 2^20552331 is an apocalyptic number.

20552331 is a deficient number, since it is larger than the sum of its proper divisors (6905269).

20552331 is a wasteful number, since it uses less digits than its factorization.

20552331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13625.

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

The square root of 20552331 is about 4533.4678779054. The cubic root of 20552331 is about 273.9178674745.

Adding to 20552331 its reverse (13325502), we get a palindrome (33877833).

The spelling of 20552331 in words is "twenty million, five hundred fifty-two thousand, three hundred thirty-one".