20339991636 has 24 divisors (see below), whose sum is σ = 47570108544. Its totient is φ = 6764264640.

The previous prime is 20339991629. The next prime is 20339991643. The reversal of 20339991636 is 63619993302.

It is an interprime number because it is at equal distance from previous prime (20339991629) and next prime (20339991643).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1961185 + ... + 1971528.

It is an arithmetic number, because the mean of its divisors is an integer number (1982087856).

Almost surely, 2^20339991636 is an apocalyptic number.

It is an amenable number.

20339991636 is an abundant number, since it is smaller than the sum of its proper divisors (27230116908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20339991636 is a wasteful number, since it uses less digits than its factorization.

20339991636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933151 (or 3933149 counting only the distinct ones).

The product of its (nonzero) digits is 1417176, while the sum is 51.

The spelling of 20339991636 in words is "twenty billion, three hundred thirty-nine million, nine hundred ninety-one thousand, six hundred thirty-six".