20490818 has 8 divisors (see below), whose sum is σ = 31257360. Its totient is φ = 10071700.

The previous prime is 20490803. The next prime is 20490823. The reversal of 20490818 is 81809402.

It is a happy number.

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, 86708 + ... + 86943.

It is an arithmetic number, because the mean of its divisors is an integer number (3907170).

Almost surely, 2^20490818 is an apocalyptic number.

20490818 is a deficient number, since it is larger than the sum of its proper divisors (10766542).

20490818 is a wasteful number, since it uses less digits than its factorization.

20490818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173712.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20490818 is about 4526.6784732296. The cubic root of 20490818 is about 273.6443162173.

The spelling of 20490818 in words is "twenty million, four hundred ninety thousand, eight hundred eighteen".