20005250451 has 4 divisors (see below), whose sum is σ = 26673667272. Its totient is φ = 13336833632.

The previous prime is 20005250437. The next prime is 20005250459. The reversal of 20005250451 is 15405250002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20005250451 - 2⁶ = 20005250387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20005250459) 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, 3334208406 + ... + 3334208411.

It is an arithmetic number, because the mean of its divisors is an integer number (6668416818).

Almost surely, 2^20005250451 is an apocalyptic number.

20005250451 is a deficient number, since it is larger than the sum of its proper divisors (6668416821).

20005250451 is an equidigital number, since it uses as much as digits as its factorization.

20005250451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668416820.

The product of its (nonzero) digits is 2000, while the sum is 24.

The spelling of 20005250451 in words is "twenty billion, five million, two hundred fifty thousand, four hundred fifty-one".