20422452251 has 4 divisors (see below), whose sum is σ = 20422927992. Its totient is φ = 20421976512.

The previous prime is 20422452247. The next prime is 20422452269. The reversal of 20422452251 is 15225422402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15225422402 = 2 ⋅7612711201.

It is a cyclic number.

It is not a de Polignac number, because 20422452251 - 2² = 20422452247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20422452221) 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, 166301 + ... + 261726.

It is an arithmetic number, because the mean of its divisors is an integer number (5105731998).

Almost surely, 2^20422452251 is an apocalyptic number.

20422452251 is a deficient number, since it is larger than the sum of its proper divisors (475741).

20422452251 is an equidigital number, since it uses as much as digits as its factorization.

20422452251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475740.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 20422452251 its reverse (15225422402), we get a palindrome (35647874653).

The spelling of 20422452251 in words is "twenty billion, four hundred twenty-two million, four hundred fifty-two thousand, two hundred fifty-one".