20350551 has 8 divisors (see below), whose sum is σ = 29221360. Its totient is φ = 12523392.

The previous prime is 20350541. The next prime is 20350559. The reversal of 20350551 is 15505302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20350551 - 2⁶ = 20350487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20350559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260866 + ... + 260943.

It is an arithmetic number, because the mean of its divisors is an integer number (3652670).

Almost surely, 2^20350551 is an apocalyptic number.

20350551 is a deficient number, since it is larger than the sum of its proper divisors (8870809).

20350551 is a wasteful number, since it uses less digits than its factorization.

20350551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521825.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20350551 is about 4511.1584986564. The cubic root of 20350551 is about 273.0184881950.

Adding to 20350551 its reverse (15505302), we get a palindrome (35855853).

The spelling of 20350551 in words is "twenty million, three hundred fifty thousand, five hundred fifty-one".