20858472 has 40 divisors (see below), whose sum is σ = 58424850. Its totient is φ = 6952608.

The previous prime is 20858441. The next prime is 20858477. The reversal of 20858472 is 27485802.

It is a happy number.

20858472 is a `hidden beast` number, since 2 + 0 + 8 + 584 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 1726596 = 4374^2 + 1314^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20858477) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15447 + ... + 16742.

Almost surely, 2^20858472 is an apocalyptic number.

It is an amenable number.

20858472 is an abundant number, since it is smaller than the sum of its proper divisors (37566378).

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

20858472 is a wasteful number, since it uses less digits than its factorization.

20858472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32207 (or 32194 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20858472 is about 4567.1076186138. The cubic root of 20858472 is about 275.2712343202.

The spelling of 20858472 in words is "twenty million, eight hundred fifty-eight thousand, four hundred seventy-two".