20553893 has 2 divisors, whose sum is σ = 20553894. Its totient is φ = 20553892.

The previous prime is 20553887. The next prime is 20553931. The reversal of 20553893 is 39835502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12271009 + 8282884 = 3503^2 + 2878^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553893 - 2⁶ = 20553829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276946 + 10276947.

It is an arithmetic number, because the mean of its divisors is an integer number (10276947).

Almost surely, 2^20553893 is an apocalyptic number.

It is an amenable number.

20553893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553893 is an equidigital number, since it uses as much as digits as its factorization.

20553893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20553893 is about 4533.6401489311. The cubic root of 20553893 is about 273.9248066528.

The spelling of 20553893 in words is "twenty million, five hundred fifty-three thousand, eight hundred ninety-three".