20874456 has 64 divisors (see below), whose sum is σ = 58370400. Its totient is φ = 6912000.

The previous prime is 20874449. The next prime is 20874463. The reversal of 20874456 is 65447802.

20874456 is a `hidden beast` number, since 208 + 7 + 445 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (20874449) and next prime (20874463).

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

It is a self number, because there is not a number n which added to its sum of digits gives 20874456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51856 + ... + 52256.

Almost surely, 2^20874456 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 20874456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29185200).

20874456 is an abundant number, since it is smaller than the sum of its proper divisors (37495944).

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

20874456 is a wasteful number, since it uses less digits than its factorization.

20874456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 20874456 is about 4568.8571875251. The cubic root of 20874456 is about 275.3415304887.

The spelling of 20874456 in words is "twenty million, eight hundred seventy-four thousand, four hundred fifty-six".