20318472 has 64 divisors (see below), whose sum is σ = 57024000. Its totient is φ = 6702912.

The previous prime is 20318471. The next prime is 20318477. The reversal of 20318472 is 27481302.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20318471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23113 + ... + 23975.

It is an arithmetic number, because the mean of its divisors is an integer number (891000).

Almost surely, 2^20318472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20318472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28512000).

20318472 is an abundant number, since it is smaller than the sum of its proper divisors (36705528).

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

20318472 is a wasteful number, since it uses less digits than its factorization.

20318472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20318472 is about 4507.6015795543. The cubic root of 20318472 is about 272.8749578305.

Adding to 20318472 its reverse (27481302), we get a palindrome (47799774).

The spelling of 20318472 in words is "twenty million, three hundred eighteen thousand, four hundred seventy-two".