20670715056 has 80 divisors (see below), whose sum is σ = 54649502208. Its totient is φ = 6729542400.

The previous prime is 20670714989. The next prime is 20670715057. The reversal of 20670715056 is 65051707602.

It is not an unprimeable number, because it can be changed into a prime (20670715057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098366 + ... + 1117026.

Almost surely, 2^20670715056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20670715056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27324751104).

20670715056 is an abundant number, since it is smaller than the sum of its proper divisors (33978787152).

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

20670715056 is a wasteful number, since it uses less digits than its factorization.

20670715056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19210 (or 19204 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 20670715056 in words is "twenty billion, six hundred seventy million, seven hundred fifteen thousand, fifty-six".