20632739 has 4 divisors (see below), whose sum is σ = 20642856. Its totient is φ = 20622624.

The previous prime is 20632709. The next prime is 20632751. The reversal of 20632739 is 93723602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20632739 - 2¹⁶ = 20567203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20632709) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 809 + ... + 6474.

It is an arithmetic number, because the mean of its divisors is an integer number (5160714).

Almost surely, 2^20632739 is an apocalyptic number.

20632739 is a deficient number, since it is larger than the sum of its proper divisors (10117).

20632739 is an equidigital number, since it uses as much as digits as its factorization.

20632739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10116.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 20632739 is about 4542.3274870929. The cubic root of 20632739 is about 274.2746238721.

The spelling of 20632739 in words is "twenty million, six hundred thirty-two thousand, seven hundred thirty-nine".