20451712 has 16 divisors (see below), whose sum is σ = 40743900. Its totient is φ = 10225792.

The previous prime is 20451709. The next prime is 20451719. The reversal of 20451712 is 21715402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79762 + ... + 80017.

Almost surely, 2^20451712 is an apocalyptic number.

It is an amenable number.

20451712 is a deficient number, since it is larger than the sum of its proper divisors (20292188).

20451712 is an equidigital number, since it uses as much as digits as its factorization.

20451712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159793 (or 159781 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20451712 is about 4522.3569076312. The cubic root of 20451712 is about 273.4701251978.

The spelling of 20451712 in words is "twenty million, four hundred fifty-one thousand, seven hundred twelve".