20139941 has 4 divisors (see below), whose sum is σ = 20208972. Its totient is φ = 20070912.

The previous prime is 20139937. The next prime is 20139971. The reversal of 20139941 is 14993102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13535041 + 6604900 = 3679^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20139941 - 2² = 20139937 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34076 + ... + 34661.

It is an arithmetic number, because the mean of its divisors is an integer number (5052243).

Almost surely, 2^20139941 is an apocalyptic number.

It is an amenable number.

20139941 is a deficient number, since it is larger than the sum of its proper divisors (69031).

20139941 is an equidigital number, since it uses as much as digits as its factorization.

20139941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69030.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20139941 is about 4487.7545610249. The cubic root of 20139941 is about 272.0733879614.

The spelling of 20139941 in words is "twenty million, one hundred thirty-nine thousand, nine hundred forty-one".