20511338990 has 8 divisors (see below), whose sum is σ = 36920410200. Its totient is φ = 8204535592.

The previous prime is 20511338977. The next prime is 20511339047. The reversal of 20511338990 is 9983311502.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1025566940 + ... + 1025566959.

It is an arithmetic number, because the mean of its divisors is an integer number (4615051275).

Almost surely, 2^20511338990 is an apocalyptic number.

20511338990 is a deficient number, since it is larger than the sum of its proper divisors (16409071210).

20511338990 is a wasteful number, since it uses less digits than its factorization.

20511338990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051133906.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 20511338990 in words is "twenty billion, five hundred eleven million, three hundred thirty-eight thousand, nine hundred ninety".