19805053 has 4 divisors (see below), whose sum is σ = 20129788. Its totient is φ = 19480320.

The previous prime is 19805041. The next prime is 19805059. The reversal of 19805053 is 35050891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 16426809 = 1838^2 + 4053^2 .

It is a cyclic number.

It is not a de Polignac number, because 19805053 - 2²¹ = 17707901 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 (19805059) 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, 162276 + ... + 162397.

It is an arithmetic number, because the mean of its divisors is an integer number (5032447).

Almost surely, 2^19805053 is an apocalyptic number.

It is an amenable number.

19805053 is a deficient number, since it is larger than the sum of its proper divisors (324735).

19805053 is an equidigital number, since it uses as much as digits as its factorization.

19805053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324734.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 19805053 is about 4450.2868446877. The cubic root of 19805053 is about 270.5569345433.

The spelling of 19805053 in words is "nineteen million, eight hundred five thousand, fifty-three".