20442451 has 2 divisors, whose sum is σ = 20442452. Its totient is φ = 20442450.

The previous prime is 20442439. The next prime is 20442467. The reversal of 20442451 is 15424402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20442451 - 2¹³ = 20434259 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20442151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221225 + 10221226.

It is an arithmetic number, because the mean of its divisors is an integer number (10221226).

Almost surely, 2^20442451 is an apocalyptic number.

20442451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442451 is an equidigital number, since it uses as much as digits as its factorization.

20442451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20442451 is about 4521.3328786985. The cubic root of 20442451 is about 273.4288411364.

Adding to 20442451 its reverse (15424402), we get a palindrome (35866853).

The spelling of 20442451 in words is "twenty million, four hundred forty-two thousand, four hundred fifty-one".