20849818 has 8 divisors (see below), whose sum is σ = 34117920. Its totient is φ = 9477180.

The previous prime is 20849813. The next prime is 20849839. The reversal of 20849818 is 81894802.

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

It is not an unprimeable number, because it can be changed into a prime (20849813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473838 + ... + 473881.

It is an arithmetic number, because the mean of its divisors is an integer number (4264740).

Almost surely, 2^20849818 is an apocalyptic number.

20849818 is a deficient number, since it is larger than the sum of its proper divisors (13268102).

20849818 is a wasteful number, since it uses less digits than its factorization.

20849818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947732.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 20849818 is about 4566.1600935578. The cubic root of 20849818 is about 275.2331598344.

The spelling of 20849818 in words is "twenty million, eight hundred forty-nine thousand, eight hundred eighteen".