20456563451 has 8 divisors (see below), whose sum is σ = 20497382400. Its totient is φ = 20415769128.

The previous prime is 20456563447. The next prime is 20456563459. The reversal of 20456563451 is 15436565402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20456563451 - 2² = 20456563447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20456563399 and 20456563408.

It is not an unprimeable number, because it can be changed into a prime (20456563459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3096650 + ... + 3103248.

It is an arithmetic number, because the mean of its divisors is an integer number (2562172800).

Almost surely, 2^20456563451 is an apocalyptic number.

20456563451 is a deficient number, since it is larger than the sum of its proper divisors (40818949).

20456563451 is an equidigital number, since it uses as much as digits as its factorization.

20456563451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20456563451 in words is "twenty billion, four hundred fifty-six million, five hundred sixty-three thousand, four hundred fifty-one".