20445250451 has 4 divisors (see below), whose sum is σ = 20477047752. Its totient is φ = 20413453152.

The previous prime is 20445250439. The next prime is 20445250453. The reversal of 20445250451 is 15405254402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15405254402 = 2 ⋅7702627201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20445250451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445250453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15897686 + ... + 15898971.

It is an arithmetic number, because the mean of its divisors is an integer number (5119261938).

Almost surely, 2^20445250451 is an apocalyptic number.

20445250451 is a deficient number, since it is larger than the sum of its proper divisors (31797301).

20445250451 is an equidigital number, since it uses as much as digits as its factorization.

20445250451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31797300.

The product of its (nonzero) digits is 32000, while the sum is 32.

The spelling of 20445250451 in words is "twenty billion, four hundred forty-five million, two hundred fifty thousand, four hundred fifty-one".