20909143056 has 40 divisors (see below), whose sum is σ = 54027729504. Its totient is φ = 6968108800.

The previous prime is 20909143051. The next prime is 20909143061. The reversal of 20909143056 is 65034190902.

It is an interprime number because it is at equal distance from previous prime (20909143051) and next prime (20909143061).

It is not an unprimeable number, because it can be changed into a prime (20909143051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170356 + ... + 266156.

Almost surely, 2^20909143056 is an apocalyptic number.

It is an amenable number.

20909143056 is an abundant number, since it is smaller than the sum of its proper divisors (33118586448).

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

20909143056 is a wasteful number, since it uses less digits than its factorization.

20909143056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100359 (or 100353 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 20909143056 in words is "twenty billion, nine hundred nine million, one hundred forty-three thousand, fifty-six".