20139490037 has 4 divisors (see below), whose sum is σ = 20141928576. Its totient is φ = 20137051500.

The previous prime is 20139490013. The next prime is 20139490061. The reversal of 20139490037 is 73009493102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20139490013) and next prime (20139490061).

It is a cyclic number.

It is not a de Polignac number, because 20139490037 - 2⁶ = 20139489973 is a prime.

It is a super-2 number, since 2×20139490037² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139490237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206839 + ... + 1223412.

It is an arithmetic number, because the mean of its divisors is an integer number (5035482144).

Almost surely, 2^20139490037 is an apocalyptic number.

It is an amenable number.

20139490037 is a deficient number, since it is larger than the sum of its proper divisors (2438539).

20139490037 is an equidigital number, since it uses as much as digits as its factorization.

20139490037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438538.

The product of its (nonzero) digits is 40824, while the sum is 38.

The spelling of 20139490037 in words is "twenty billion, one hundred thirty-nine million, four hundred ninety thousand, thirty-seven".