19745057 has 4 divisors (see below), whose sum is σ = 19756356. Its totient is φ = 19733760.

The previous prime is 19745051. The next prime is 19745069. The reversal of 19745057 is 75054791.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 15062161 = 2164^2 + 3881^2 .

It is a cyclic number.

It is not a de Polignac number, because 19745057 - 2⁶ = 19744993 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 19745057.

It is not an unprimeable number, because it can be changed into a prime (19745051) 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, 2408 + ... + 6729.

It is an arithmetic number, because the mean of its divisors is an integer number (4939089).

Almost surely, 2^19745057 is an apocalyptic number.

It is an amenable number.

19745057 is a deficient number, since it is larger than the sum of its proper divisors (11299).

19745057 is an equidigital number, since it uses as much as digits as its factorization.

19745057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11298.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 19745057 is about 4443.5410429071. The cubic root of 19745057 is about 270.2834563135.

It can be divided in two parts, 197 and 45057, that added together give a palindrome (45254).

The spelling of 19745057 in words is "nineteen million, seven hundred forty-five thousand, fifty-seven".