20395039939 has 4 divisors (see below), whose sum is σ = 20399744680. Its totient is φ = 20390335200.

The previous prime is 20395039919. The next prime is 20395039963. The reversal of 20395039939 is 93993059302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93993059302 = 2 ⋅46996529651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20395039939 is a prime.

It is a super-2 number, since 2×20395039939² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20395039919) 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, 2345862 + ... + 2354539.

It is an arithmetic number, because the mean of its divisors is an integer number (5099936170).

Almost surely, 2^20395039939 is an apocalyptic number.

20395039939 is a deficient number, since it is larger than the sum of its proper divisors (4704741).

20395039939 is an equidigital number, since it uses as much as digits as its factorization.

20395039939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704740.

The product of its (nonzero) digits is 1771470, while the sum is 52.

The spelling of 20395039939 in words is "twenty billion, three hundred ninety-five million, thirty-nine thousand, nine hundred thirty-nine".