20932789 has 4 divisors (see below), whose sum is σ = 20952460. Its totient is φ = 20913120.

The previous prime is 20932777. The next prime is 20932801. The reversal of 20932789 is 98723902.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20932777) and next prime (20932801).

It can be written as a sum of positive squares in 2 ways, for example, as 5267025 + 15665764 = 2295^2 + 3958^2 .

It is a cyclic number.

It is not a de Polignac number, because 20932789 - 2⁵ = 20932757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20932759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8142 + ... + 10399.

It is an arithmetic number, because the mean of its divisors is an integer number (5238115).

Almost surely, 2^20932789 is an apocalyptic number.

It is an amenable number.

20932789 is a deficient number, since it is larger than the sum of its proper divisors (19671).

20932789 is a wasteful number, since it uses less digits than its factorization.

20932789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19670.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 20932789 is about 4575.2364966196. The cubic root of 20932789 is about 275.5977696544.

The spelling of 20932789 in words is "twenty million, nine hundred thirty-two thousand, seven hundred eighty-nine".