20352251 has 4 divisors (see below), whose sum is σ = 20399904. Its totient is φ = 20304600.

The previous prime is 20352203. The next prime is 20352259. The reversal of 20352251 is 15225302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20352251 - 2⁶ = 20352187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20352259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23180 + ... + 24041.

It is an arithmetic number, because the mean of its divisors is an integer number (5099976).

Almost surely, 2^20352251 is an apocalyptic number.

20352251 is a deficient number, since it is larger than the sum of its proper divisors (47653).

20352251 is an equidigital number, since it uses as much as digits as its factorization.

20352251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47652.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20352251 is about 4511.3469163876. The cubic root of 20352251 is about 273.0260902579.

Adding to 20352251 its reverse (15225302), we get a palindrome (35577553).

The spelling of 20352251 in words is "twenty million, three hundred fifty-two thousand, two hundred fifty-one".