20143456 has 12 divisors (see below), whose sum is σ = 39657492. Its totient is φ = 10071712.

The previous prime is 20143451. The next prime is 20143489. The reversal of 20143456 is 65434102.

It is a self number, because there is not a number n which added to its sum of digits gives 20143456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314710 + ... + 314773.

It is an arithmetic number, because the mean of its divisors is an integer number (3304791).

Almost surely, 2^20143456 is an apocalyptic number.

It is an amenable number.

20143456 is a deficient number, since it is larger than the sum of its proper divisors (19514036).

20143456 is an equidigital number, since it uses as much as digits as its factorization.

20143456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629493 (or 629485 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20143456 is about 4488.1461651778. The cubic root of 20143456 is about 272.0892152558.

Adding to 20143456 its reverse (65434102), we get a palindrome (85577558).

The spelling of 20143456 in words is "twenty million, one hundred forty-three thousand, four hundred fifty-six".