19797533 has 4 divisors (see below), whose sum is σ = 22625760. Its totient is φ = 16969308.

The previous prime is 19797529. The next prime is 19797539. The reversal of 19797533 is 33579791.

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 a cyclic number.

It is not a de Polignac number, because 19797533 - 2² = 19797529 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 (19797539) 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, 1414103 + ... + 1414116.

It is an arithmetic number, because the mean of its divisors is an integer number (5656440).

Almost surely, 2^19797533 is an apocalyptic number.

It is an amenable number.

19797533 is a deficient number, since it is larger than the sum of its proper divisors (2828227).

19797533 is an equidigital number, since it uses as much as digits as its factorization.

19797533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828226.

The product of its digits is 178605, while the sum is 44.

The square root of 19797533 is about 4449.4418751120. The cubic root of 19797533 is about 270.5226866216.

The spelling of 19797533 in words is "nineteen million, seven hundred ninety-seven thousand, five hundred thirty-three".