20139814 has 8 divisors (see below), whose sum is σ = 30309048. Its totient is φ = 10036800.

The previous prime is 20139793. The next prime is 20139851. The reversal of 20139814 is 41893102.

It is a happy number.

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

It is a super-2 number, since 2×20139814² = 811224215909192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 15787 + ... + 17014.

It is an arithmetic number, because the mean of its divisors is an integer number (3788631).

Almost surely, 2^20139814 is an apocalyptic number.

20139814 is a deficient number, since it is larger than the sum of its proper divisors (10169234).

20139814 is a wasteful number, since it uses less digits than its factorization.

20139814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33110.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20139814 is about 4487.7404113875. The cubic root of 20139814 is about 272.0728160730.

The spelling of 20139814 in words is "twenty million, one hundred thirty-nine thousand, eight hundred fourteen".