20318969975 has 12 divisors (see below), whose sum is σ = 25207379184. Its totient is φ = 16247526720.

The previous prime is 20318969963. The next prime is 20318969977. The reversal of 20318969975 is 57996981302.

It is not a de Polignac number, because 20318969975 - 2³² = 16024002679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20318969977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136739 + ... + 243588.

It is an arithmetic number, because the mean of its divisors is an integer number (2100614932).

Almost surely, 2^20318969975 is an apocalyptic number.

20318969975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20318969975 is a deficient number, since it is larger than the sum of its proper divisors (4888409209).

20318969975 is a wasteful number, since it uses less digits than its factorization.

20318969975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382474 (or 382469 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 20318969975 in words is "twenty billion, three hundred eighteen million, nine hundred sixty-nine thousand, nine hundred seventy-five".