20971056 has 40 divisors (see below), whose sum is σ = 54354160. Its totient is φ = 6967296.

The previous prime is 20971051. The next prime is 20971063. The reversal of 20971056 is 65017902.

It is not an unprimeable number, because it can be changed into a prime (20971051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20280 + ... + 21288.

It is an arithmetic number, because the mean of its divisors is an integer number (1358854).

Almost surely, 2^20971056 is an apocalyptic number.

It is an amenable number.

20971056 is an abundant number, since it is smaller than the sum of its proper divisors (33383104).

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

20971056 is a wasteful number, since it uses less digits than its factorization.

20971056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 20971056 is about 4579.4165567242. The cubic root of 20971056 is about 275.7656065003.

Adding to 20971056 its reverse (65017902), we get a palindrome (85988958).

The spelling of 20971056 in words is "twenty million, nine hundred seventy-one thousand, fifty-six".