20506239 has 12 divisors (see below), whose sum is σ = 31898776. Its totient is φ = 12619152.

The previous prime is 20506201. The next prime is 20506243. The reversal of 20506239 is 93260502.

It is not a de Polignac number, because 20506239 - 2⁸ = 20505983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506249) 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, 87517 + ... + 87750.

Almost surely, 2^20506239 is an apocalyptic number.

20506239 is a deficient number, since it is larger than the sum of its proper divisors (11392537).

20506239 is a wasteful number, since it uses less digits than its factorization.

20506239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175286 (or 175283 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20506239 is about 4528.3814989464. The cubic root of 20506239 is about 273.7129455069.

The spelling of 20506239 in words is "twenty million, five hundred six thousand, two hundred thirty-nine".