20818472 has 16 divisors (see below), whose sum is σ = 41331060. Its totient is φ = 9796864.

The previous prime is 20818459. The next prime is 20818477. The reversal of 20818472 is 27481802.

It can be written as a sum of positive squares in 2 ways, for example, as 15952036 + 4866436 = 3994^2 + 2206^2 .

It is not an unprimeable number, because it can be changed into a prime (20818477) 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, 76403 + ... + 76674.

Almost surely, 2^20818472 is an apocalyptic number.

It is an amenable number.

20818472 is a deficient number, since it is larger than the sum of its proper divisors (20512588).

20818472 is a wasteful number, since it uses less digits than its factorization.

20818472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153100 (or 153096 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20818472 is about 4562.7263779455. The cubic root of 20818472 is about 275.0951604555.

The spelling of 20818472 in words is "twenty million, eight hundred eighteen thousand, four hundred seventy-two".