20407456 has 24 divisors (see below), whose sum is σ = 41114304. Its totient is φ = 9965760.

The previous prime is 20407423. The next prime is 20407469. The reversal of 20407456 is 65470402.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6040 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (1713096).

Almost surely, 2^20407456 is an apocalyptic number.

It is an amenable number.

20407456 is an abundant number, since it is smaller than the sum of its proper divisors (20706848).

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

20407456 is a wasteful number, since it uses less digits than its factorization.

20407456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14884 (or 14876 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20407456 is about 4517.4612339233. The cubic root of 20407456 is about 273.2727263337.

Adding to 20407456 its reverse (65470402), we get a palindrome (85877858).

The spelling of 20407456 in words is "twenty million, four hundred seven thousand, four hundred fifty-six".