20451056 has 10 divisors (see below), whose sum is σ = 39623952. Its totient is φ = 10225520.

The previous prime is 20451037. The next prime is 20451059. The reversal of 20451056 is 65015402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451059) 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, 639080 + ... + 639111.

Almost surely, 2^20451056 is an apocalyptic number.

It is an amenable number.

20451056 is a deficient number, since it is larger than the sum of its proper divisors (19172896).

20451056 is a wasteful number, since it uses less digits than its factorization.

20451056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278199 (or 1278193 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20451056 is about 4522.2843784972. The cubic root of 20451056 is about 273.4672012646.

Adding to 20451056 its reverse (65015402), we get a palindrome (85466458).

The spelling of 20451056 in words is "twenty million, four hundred fifty-one thousand, fifty-six".