20518472 has 16 divisors (see below), whose sum is σ = 41431740. Its totient is φ = 9470016.

The previous prime is 20518451. The next prime is 20518483. The reversal of 20518472 is 27481502.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 1976836 = 4306^2 + 1406^2 .

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, 98543 + ... + 98750.

Almost surely, 2^20518472 is an apocalyptic number.

It is an amenable number.

20518472 is an abundant number, since it is smaller than the sum of its proper divisors (20913268).

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

20518472 is a wasteful number, since it uses less digits than its factorization.

20518472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197312 (or 197308 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20518472 is about 4529.7320009025. The cubic root of 20518472 is about 273.7673625206.

Adding to 20518472 its reverse (27481502), we get a palindrome (47999974).

The spelling of 20518472 in words is "twenty million, five hundred eighteen thousand, four hundred seventy-two".