20750639 has 16 divisors (see below), whose sum is σ = 26138112. Its totient is φ = 16033248.

The previous prime is 20750627. The next prime is 20750647. The reversal of 20750639 is 93605702.

It is not a de Polignac number, because 20750639 - 2¹² = 20746543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750239) 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 15 ways as a sum of consecutive naturals, for example, 1262 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1633632).

Almost surely, 2^20750639 is an apocalyptic number.

20750639 is a deficient number, since it is larger than the sum of its proper divisors (5387473).

20750639 is a wasteful number, since it uses less digits than its factorization.

20750639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20750639 is about 4555.2869283943. The cubic root of 20750639 is about 274.7960537449.

The spelling of 20750639 in words is "twenty million, seven hundred fifty thousand, six hundred thirty-nine".