20631056 has 40 divisors (see below), whose sum is σ = 41378304. Its totient is φ = 9959040.

The previous prime is 20631043. The next prime is 20631097. The reversal of 20631056 is 65013602.

20631056 = 229² + 230² + ... + 419².

20631056 is nontrivially palindromic in base 13.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 107921 + ... + 108111.

Almost surely, 2^20631056 is an apocalyptic number.

It is an amenable number.

20631056 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20631056 is a wasteful number, since it uses less digits than its factorization.

20631056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20631056 is about 4542.1422258666. The cubic root of 20631056 is about 274.2671661978.

Adding to 20631056 its reverse (65013602), we get a palindrome (85644658).

The spelling of 20631056 in words is "twenty million, six hundred thirty-one thousand, fifty-six".