20725456 has 20 divisors (see below), whose sum is σ = 40448800. Its totient is φ = 10287072.

The previous prime is 20725451. The next prime is 20725457. The reversal of 20725456 is 65452702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2436 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (2022440).

Almost surely, 2^20725456 is an apocalyptic number.

It is an amenable number.

20725456 is a deficient number, since it is larger than the sum of its proper divisors (19723344).

20725456 is a wasteful number, since it uses less digits than its factorization.

20725456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466 (or 9460 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20725456 is about 4552.5219384425. The cubic root of 20725456 is about 274.6848444730.

The spelling of 20725456 in words is "twenty million, seven hundred twenty-five thousand, four hundred fifty-six".