20518885 has 8 divisors (see below), whose sum is σ = 24669216. Its totient is φ = 16384080.

The previous prime is 20518873. The next prime is 20518891. The reversal of 20518885 is 58881502.

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

It is not a de Polignac number, because 20518885 - 2⁵ = 20518853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (3083652).

Almost surely, 2^20518885 is an apocalyptic number.

It is an amenable number.

20518885 is a deficient number, since it is larger than the sum of its proper divisors (4150331).

20518885 is an equidigital number, since it uses as much as digits as its factorization.

20518885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763.

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 20518885 is about 4529.7775883591. Note that the first 3 decimals coincide. The cubic root of 20518885 is about 273.7691993234.

The spelling of 20518885 in words is "twenty million, five hundred eighteen thousand, eight hundred eighty-five".