20949818 has 8 divisors (see below), whose sum is σ = 33078720. Its totient is φ = 9923580.

The previous prime is 20949809. The next prime is 20949823. The reversal of 20949818 is 81894902.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275618 + ... + 275693.

It is an arithmetic number, because the mean of its divisors is an integer number (4134840).

Almost surely, 2^20949818 is an apocalyptic number.

20949818 is a deficient number, since it is larger than the sum of its proper divisors (12128902).

20949818 is a wasteful number, since it uses less digits than its factorization.

20949818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551332.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 20949818 is about 4577.0971149846. The cubic root of 20949818 is about 275.6724830996.

The spelling of 20949818 in words is "twenty million, nine hundred forty-nine thousand, eight hundred eighteen".