20610139 has 8 divisors (see below), whose sum is σ = 23461632. Its totient is φ = 17921640.

The previous prime is 20610119. The next prime is 20610151. The reversal of 20610139 is 93101602.

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

It is not a de Polignac number, because 20610139 - 2¹⁹ = 20085851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20610119) 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, 40479 + ... + 40984.

It is an arithmetic number, because the mean of its divisors is an integer number (2932704).

Almost surely, 2^20610139 is an apocalyptic number.

20610139 is a deficient number, since it is larger than the sum of its proper divisors (2851493).

20610139 is a wasteful number, since it uses less digits than its factorization.

20610139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81497.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20610139 is about 4539.8390940649. The cubic root of 20610139 is about 274.1744453632.

The spelling of 20610139 in words is "twenty million, six hundred ten thousand, one hundred thirty-nine".