20784057 has 16 divisors (see below), whose sum is σ = 31743360. Its totient is φ = 11849472.

The previous prime is 20784041. The next prime is 20784077. The reversal of 20784057 is 75048702.

It is not a de Polignac number, because 20784057 - 2⁴ = 20784041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20784017) 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, 11619 + ... + 13287.

It is an arithmetic number, because the mean of its divisors is an integer number (1983960).

Almost surely, 2^20784057 is an apocalyptic number.

It is an amenable number.

20784057 is a deficient number, since it is larger than the sum of its proper divisors (10959303).

20784057 is a wasteful number, since it uses less digits than its factorization.

20784057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20784057 is about 4558.9534983371. The cubic root of 20784057 is about 274.9434903170.

The spelling of 20784057 in words is "twenty million, seven hundred eighty-four thousand, fifty-seven".