20214639 has 12 divisors (see below), whose sum is σ = 29694600. Its totient is φ = 13247664.

The previous prime is 20214611. The next prime is 20214647. The reversal of 20214639 is 93641202.

20214639 is a `hidden beast` number, since 2 + 0 + 21 + 4 + 639 = 666.

It is not a de Polignac number, because 20214639 - 2⁹ = 20214127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20214739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18504 + ... + 19565.

It is an arithmetic number, because the mean of its divisors is an integer number (2474550).

Almost surely, 2^20214639 is an apocalyptic number.

20214639 is a deficient number, since it is larger than the sum of its proper divisors (9479961).

20214639 is a wasteful number, since it uses less digits than its factorization.

20214639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38134 (or 38131 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20214639 is about 4496.0692832740. The cubic root of 20214639 is about 272.4093416683.

It can be divided in two parts, 202 and 14639, that added together give a palindrome (14841).

The spelling of 20214639 in words is "twenty million, two hundred fourteen thousand, six hundred thirty-nine".