20602397939 has 4 divisors (see below), whose sum is σ = 20616405120. Its totient is φ = 20588390760.

The previous prime is 20602397909. The next prime is 20602397941. The reversal of 20602397939 is 93979320602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93979320602 = 2 ⋅46989660301.

It is a cyclic number.

It is not a de Polignac number, because 20602397939 - 2²⁴ = 20585620723 is a prime.

It is a super-2 number, since 2×20602397939² (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 (20602397909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7001384 + ... + 7004325.

It is an arithmetic number, because the mean of its divisors is an integer number (5154101280).

Almost surely, 2^20602397939 is an apocalyptic number.

20602397939 is a deficient number, since it is larger than the sum of its proper divisors (14007181).

20602397939 is a wasteful number, since it uses less digits than its factorization.

20602397939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14007180.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The spelling of 20602397939 in words is "twenty billion, six hundred two million, three hundred ninety-seven thousand, nine hundred thirty-nine".