20432551 has 2 divisors, whose sum is σ = 20432552. Its totient is φ = 20432550.

The previous prime is 20432527. The next prime is 20432561. The reversal of 20432551 is 15523402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20432551 - 2⁹ = 20432039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20432561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216275 + 10216276.

It is an arithmetic number, because the mean of its divisors is an integer number (10216276).

Almost surely, 2^20432551 is an apocalyptic number.

20432551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432551 is an equidigital number, since it uses as much as digits as its factorization.

20432551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20432551 is about 4520.2379362153. The cubic root of 20432551 is about 273.3846947239.

Adding to 20432551 its reverse (15523402), we get a palindrome (35955953).

The spelling of 20432551 in words is "twenty million, four hundred thirty-two thousand, five hundred fifty-one".