20340244451 has 4 divisors (see below), whose sum is σ = 20340761112. Its totient is φ = 20339727792.

The previous prime is 20340244411. The next prime is 20340244481. The reversal of 20340244451 is 15444204302.

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 20340244451 - 2⁶ = 20340244387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20340244411) 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, 193925 + ... + 279798.

It is an arithmetic number, because the mean of its divisors is an integer number (5085190278).

Almost surely, 2^20340244451 is an apocalyptic number.

20340244451 is a deficient number, since it is larger than the sum of its proper divisors (516661).

20340244451 is an equidigital number, since it uses as much as digits as its factorization.

20340244451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516660.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 20340244451 its reverse (15444204302), we get a palindrome (35784448753).

The spelling of 20340244451 in words is "twenty billion, three hundred forty million, two hundred forty-four thousand, four hundred fifty-one".