20553351 has 32 divisors (see below), whose sum is σ = 34191360. Its totient is φ = 10692864.

The previous prime is 20553331. The next prime is 20553353. The reversal of 20553351 is 15335502.

It is not a de Polignac number, because 20553351 - 2⁶ = 20553287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21091 + ... + 22043.

It is an arithmetic number, because the mean of its divisors is an integer number (1068480).

Almost surely, 2^20553351 is an apocalyptic number.

20553351 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20553351 is a deficient number, since it is larger than the sum of its proper divisors (13638009).

20553351 is a wasteful number, since it uses less digits than its factorization.

20553351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 20553351 is about 4533.5803731709. The cubic root of 20553351 is about 273.9223988600.

Adding to 20553351 its reverse (15335502), we get a palindrome (35888853).

The spelling of 20553351 in words is "twenty million, five hundred fifty-three thousand, three hundred fifty-one".