20598639 has 16 divisors (see below), whose sum is σ = 28764672. Its totient is φ = 13087008.

The previous prime is 20598623. The next prime is 20598653. The reversal of 20598639 is 93689502.

It is not a de Polignac number, because 20598639 - 2⁴ = 20598623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20598639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20598619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33297 + ... + 33909.

It is an arithmetic number, because the mean of its divisors is an integer number (1797792).

Almost surely, 2^20598639 is an apocalyptic number.

20598639 is a deficient number, since it is larger than the sum of its proper divisors (8166033).

20598639 is a wasteful number, since it uses less digits than its factorization.

20598639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 20598639 is about 4538.5723526237. The cubic root of 20598639 is about 274.1234414578.

The spelling of 20598639 in words is "twenty million, five hundred ninety-eight thousand, six hundred thirty-nine".