20138541494 has 4 divisors (see below), whose sum is σ = 30207812244. Its totient is φ = 10069270746.

The previous prime is 20138541491. The next prime is 20138541497. The reversal of 20138541494 is 49414583102.

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

It is an interprime number because it is at equal distance from previous prime (20138541491) and next prime (20138541497).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138541491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5034635372 + ... + 5034635375.

It is an arithmetic number, because the mean of its divisors is an integer number (7551953061).

Almost surely, 2^20138541494 is an apocalyptic number.

20138541494 is a deficient number, since it is larger than the sum of its proper divisors (10069270750).

20138541494 is a wasteful number, since it uses less digits than its factorization.

20138541494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069270749.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 20138541494 in words is "twenty billion, one hundred thirty-eight million, five hundred forty-one thousand, four hundred ninety-four".