20624885 has 8 divisors (see below), whose sum is σ = 24859320. Its totient is φ = 16426944.

The previous prime is 20624881. The next prime is 20624911. The reversal of 20624885 is 58842602.

It can be written as a sum of positive squares in 4 ways, for example, as 11437924 + 9186961 = 3382^2 + 3031^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20624885 - 2² = 20624881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20624881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7862 + ... + 10151.

It is an arithmetic number, because the mean of its divisors is an integer number (3107415).

Almost surely, 2^20624885 is an apocalyptic number.

It is an amenable number.

20624885 is a deficient number, since it is larger than the sum of its proper divisors (4234435).

20624885 is a wasteful number, since it uses less digits than its factorization.

20624885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18247.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 20624885 is about 4541.4628700453. The cubic root of 20624885 is about 274.2398179215.

The spelling of 20624885 in words is "twenty million, six hundred twenty-four thousand, eight hundred eighty-five".