20242451 has 2 divisors, whose sum is σ = 20242452. Its totient is φ = 20242450.

The previous prime is 20242447. The next prime is 20242459. The reversal of 20242451 is 15424202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20242451 - 2² = 20242447 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20242459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121225 + 10121226.

It is an arithmetic number, because the mean of its divisors is an integer number (10121226).

Almost surely, 2^20242451 is an apocalyptic number.

20242451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20242451 is an equidigital number, since it uses as much as digits as its factorization.

20242451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20242451 is about 4499.1611440356. The cubic root of 20242451 is about 272.5342144846.

Adding to 20242451 its reverse (15424202), we get a palindrome (35666653).

The spelling of 20242451 in words is "twenty million, two hundred forty-two thousand, four hundred fifty-one".