20828673 has 6 divisors (see below), whose sum is σ = 30085874. Its totient is φ = 13885776.

The previous prime is 20828671. The next prime is 20828737. The reversal of 20828673 is 37682802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19210689 + 1617984 = 4383^2 + 1272^2 .

It is not a de Polignac number, because 20828673 - 2¹ = 20828671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20828671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1157140 + ... + 1157157.

Almost surely, 2^20828673 is an apocalyptic number.

It is an amenable number.

20828673 is a deficient number, since it is larger than the sum of its proper divisors (9257201).

20828673 is a wasteful number, since it uses less digits than its factorization.

20828673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314303 (or 2314300 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20828673 is about 4563.8441033848. The cubic root of 20828673 is about 275.1400851023.

The spelling of 20828673 in words is "twenty million, eight hundred twenty-eight thousand, six hundred seventy-three".