20450139 has 8 divisors (see below), whose sum is σ = 27309840. Its totient is φ = 13611936.

The previous prime is 20450117. The next prime is 20450141. The reversal of 20450139 is 93105402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20450139 - 2⁵ = 20450107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20450149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3004 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (3413730).

Almost surely, 2^20450139 is an apocalyptic number.

20450139 is a deficient number, since it is larger than the sum of its proper divisors (6859701).

20450139 is a wasteful number, since it uses less digits than its factorization.

20450139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10749.

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

The square root of 20450139 is about 4522.1829905478. The cubic root of 20450139 is about 273.4631138934.

The spelling of 20450139 in words is "twenty million, four hundred fifty thousand, one hundred thirty-nine".