20639482 has 8 divisors (see below), whose sum is σ = 31714452. Its totient is φ = 10068000.

The previous prime is 20639471. The next prime is 20639483. The reversal of 20639482 is 28493602.

It can be written as a sum of positive squares in 2 ways, for example, as 16801801 + 3837681 = 4099^2 + 1959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20639483) 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 3 ways as a sum of consecutive naturals, for example, 125769 + ... + 125932.

Almost surely, 2^20639482 is an apocalyptic number.

20639482 is a deficient number, since it is larger than the sum of its proper divisors (11074970).

20639482 is a wasteful number, since it uses less digits than its factorization.

20639482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251744.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20639482 is about 4543.0696670863. The cubic root of 20639482 is about 274.3044992456.

The spelling of 20639482 in words is "twenty million, six hundred thirty-nine thousand, four hundred eighty-two".