20933842439 has 4 divisors (see below), whose sum is σ = 22035623640. Its totient is φ = 19832061240.

The previous prime is 20933842399. The next prime is 20933842453. The reversal of 20933842439 is 93424833902.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20933842439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20933842393 and 20933842402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20933842339) 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, 550890572 + ... + 550890609.

It is an arithmetic number, because the mean of its divisors is an integer number (5508905910).

Almost surely, 2^20933842439 is an apocalyptic number.

20933842439 is a deficient number, since it is larger than the sum of its proper divisors (1101781201).

20933842439 is a wasteful number, since it uses less digits than its factorization.

20933842439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101781200.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 20933842439 in words is "twenty billion, nine hundred thirty-three million, eight hundred forty-two thousand, four hundred thirty-nine".