20828047 has 16 divisors (see below), whose sum is σ = 22572000. Its totient is φ = 19160064.

The previous prime is 20828033. The next prime is 20828053. The reversal of 20828047 is 74082802.

It is a cyclic number.

It is not a de Polignac number, because 20828047 - 2¹¹ = 20825999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184263 + ... + 184375.

It is an arithmetic number, because the mean of its divisors is an integer number (1410750).

Almost surely, 2^20828047 is an apocalyptic number.

20828047 is a deficient number, since it is larger than the sum of its proper divisors (1743953).

20828047 is a wasteful number, since it uses less digits than its factorization.

20828047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20828047 is about 4563.7755203340. The cubic root of 20828047 is about 275.1373286550.

The spelling of 20828047 in words is "twenty million, eight hundred twenty-eight thousand, forty-seven".