20553213 has 4 divisors (see below), whose sum is σ = 27404288. Its totient is φ = 13702140.

The previous prime is 20553179. The next prime is 20553227. The reversal of 20553213 is 31235502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20553213 - 2¹⁴ = 20536829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20553213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3425533 + ... + 3425538.

It is an arithmetic number, because the mean of its divisors is an integer number (6851072).

Almost surely, 2^20553213 is an apocalyptic number.

It is an amenable number.

20553213 is a deficient number, since it is larger than the sum of its proper divisors (6851075).

20553213 is an equidigital number, since it uses as much as digits as its factorization.

20553213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851074.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20553213 is about 4533.5651533865. The cubic root of 20553213 is about 273.9217857989.

Adding to 20553213 its reverse (31235502), we get a palindrome (51788715).

The spelling of 20553213 in words is "twenty million, five hundred fifty-three thousand, two hundred thirteen".