20344451 has 4 divisors (see below), whose sum is σ = 20378904. Its totient is φ = 20310000.

The previous prime is 20344447. The next prime is 20344453. The reversal of 20344451 is 15444302.

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 20344451 - 2² = 20344447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16325 + ... + 17526.

It is an arithmetic number, because the mean of its divisors is an integer number (5094726).

Almost surely, 2^20344451 is an apocalyptic number.

20344451 is a deficient number, since it is larger than the sum of its proper divisors (34453).

20344451 is an equidigital number, since it uses as much as digits as its factorization.

20344451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34452.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20344451 is about 4510.4823467119. The cubic root of 20344451 is about 272.9912067190.

Adding to 20344451 its reverse (15444302), we get a palindrome (35788753).

The spelling of 20344451 in words is "twenty million, three hundred forty-four thousand, four hundred fifty-one".