20461451 has 2 divisors, whose sum is σ = 20461452. Its totient is φ = 20461450.

The previous prime is 20461439. The next prime is 20461453. The reversal of 20461451 is 15416402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20461451 is a prime.

Together with 20461453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20461453) 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 as a sum of consecutive naturals, namely, 10230725 + 10230726.

It is an arithmetic number, because the mean of its divisors is an integer number (10230726).

Almost surely, 2^20461451 is an apocalyptic number.

20461451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20461451 is an equidigital number, since it uses as much as digits as its factorization.

20461451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20461451 is about 4523.4335410173. The cubic root of 20461451 is about 273.5135266647.

Adding to 20461451 its reverse (15416402), we get a palindrome (35877853).

The spelling of 20461451 in words is "twenty million, four hundred sixty-one thousand, four hundred fifty-one".