20244551 has 2 divisors, whose sum is σ = 20244552. Its totient is φ = 20244550.

The previous prime is 20244533. The next prime is 20244559. The reversal of 20244551 is 15544202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20244551 - 2¹⁸ = 19982407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20244559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122275 + 10122276.

It is an arithmetic number, because the mean of its divisors is an integer number (10122276).

Almost surely, 2^20244551 is an apocalyptic number.

20244551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244551 is an equidigital number, since it uses as much as digits as its factorization.

20244551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20244551 is about 4499.3945148209. The cubic root of 20244551 is about 272.5436386079.

Adding to 20244551 its reverse (15544202), we get a palindrome (35788753).

The spelling of 20244551 in words is "twenty million, two hundred forty-four thousand, five hundred fifty-one".