19770243 has 4 divisors (see below), whose sum is σ = 26360328. Its totient is φ = 13180160.

The previous prime is 19770229. The next prime is 19770253. The reversal of 19770243 is 34207791.

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

It is a cyclic number.

It is not a de Polignac number, because 19770243 - 2⁹ = 19769731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19770253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3295038 + ... + 3295043.

It is an arithmetic number, because the mean of its divisors is an integer number (6590082).

Almost surely, 2^19770243 is an apocalyptic number.

19770243 is a deficient number, since it is larger than the sum of its proper divisors (6590085).

19770243 is an equidigital number, since it uses as much as digits as its factorization.

19770243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6590084.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 19770243 is about 4446.3741408028. The cubic root of 19770243 is about 270.3983283847.

The spelling of 19770243 in words is "nineteen million, seven hundred seventy thousand, two hundred forty-three".