20130456 has 16 divisors (see below), whose sum is σ = 50326200. Its totient is φ = 6710144.

The previous prime is 20130449. The next prime is 20130457. The reversal of 20130456 is 65403102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130457) 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 3 ways as a sum of consecutive naturals, for example, 419361 + ... + 419408.

Almost surely, 2^20130456 is an apocalyptic number.

It is an amenable number.

20130456 is an abundant number, since it is smaller than the sum of its proper divisors (30195744).

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

20130456 is a wasteful number, since it uses less digits than its factorization.

20130456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838778 (or 838774 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20130456 is about 4486.6976720078. The cubic root of 20130456 is about 272.0306698404.

Adding to 20130456 its reverse (65403102), we get a palindrome (85533558).

The spelling of 20130456 in words is "twenty million, one hundred thirty thousand, four hundred fifty-six".