20974818 has 16 divisors (see below), whose sum is σ = 41995296. Its totient is φ = 6984000.

The previous prime is 20974813. The next prime is 20974829. The reversal of 20974818 is 81847902.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20974813) 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, 8193 + ... + 10443.

It is an arithmetic number, because the mean of its divisors is an integer number (2624706).

Almost surely, 2^20974818 is an apocalyptic number.

20974818 is an abundant number, since it is smaller than the sum of its proper divisors (21020478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20974818 is a wasteful number, since it uses less digits than its factorization.

20974818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3809.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20974818 is about 4579.8272893200. The cubic root of 20974818 is about 275.7820953883.

The spelling of 20974818 in words is "twenty million, nine hundred seventy-four thousand, eight hundred eighteen".