20171056 has 10 divisors (see below), whose sum is σ = 39081452. Its totient is φ = 10085520.

The previous prime is 20171051. The next prime is 20171071. The reversal of 20171056 is 65017102.

It is not an unprimeable number, because it can be changed into a prime (20171051) 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 as a sum of consecutive naturals, namely, 630330 + ... + 630361.

Almost surely, 2^20171056 is an apocalyptic number.

It is an amenable number.

20171056 is a deficient number, since it is larger than the sum of its proper divisors (18910396).

20171056 is a wasteful number, since it uses less digits than its factorization.

20171056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260699 (or 1260693 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20171056 is about 4491.2198788302. The cubic root of 20171056 is about 272.2134282195.

Adding to 20171056 its reverse (65017102), we get a palindrome (85188158).

The spelling of 20171056 in words is "twenty million, one hundred seventy-one thousand, fifty-six".