20745072 has 50 divisors (see below), whose sum is σ = 60046008. Its totient is φ = 6914592.

The previous prime is 20745061. The next prime is 20745073. The reversal of 20745072 is 27054702.

20745072 is a `hidden beast` number, since 207 + 450 + 7 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745073) 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, 6708 + ... + 9299.

Almost surely, 2^20745072 is an apocalyptic number.

It is an amenable number.

20745072 is an abundant number, since it is smaller than the sum of its proper divisors (39300936).

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

20745072 is a wasteful number, since it uses less digits than its factorization.

20745072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16027 (or 16012 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20745072 is about 4554.6758391789. The cubic root of 20745072 is about 274.7714773699.

Adding to 20745072 its reverse (27054702), we get a palindrome (47799774).

The spelling of 20745072 in words is "twenty million, seven hundred forty-five thousand, seventy-two".