20785072 has 40 divisors (see below), whose sum is σ = 50211072. Its totient is φ = 8097600.

The previous prime is 20785057. The next prime is 20785081. The reversal of 20785072 is 27058702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7204 + ... + 9667.

Almost surely, 2^20785072 is an apocalyptic number.

20785072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20785072 is an abundant number, since it is smaller than the sum of its proper divisors (29426000).

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

20785072 is a wasteful number, since it uses less digits than its factorization.

20785072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16897 (or 16891 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 20785072 is about 4559.0648163850. The cubic root of 20785072 is about 274.9479659126.

The spelling of 20785072 in words is "twenty million, seven hundred eighty-five thousand, seventy-two".