20252139 has 4 divisors (see below), whose sum is σ = 27002856. Its totient is φ = 13501424.

The previous prime is 20252137. The next prime is 20252149. The reversal of 20252139 is 93125202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20252139 - 2¹ = 20252137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20252131) 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 3 ways as a sum of consecutive naturals, for example, 3375354 + ... + 3375359.

It is an arithmetic number, because the mean of its divisors is an integer number (6750714).

Almost surely, 2^20252139 is an apocalyptic number.

20252139 is a deficient number, since it is larger than the sum of its proper divisors (6750717).

20252139 is an equidigital number, since it uses as much as digits as its factorization.

20252139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750716.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20252139 is about 4500.2376603908. The cubic root of 20252139 is about 272.5776856757.

The spelling of 20252139 in words is "twenty million, two hundred fifty-two thousand, one hundred thirty-nine".