19964057 has 4 divisors (see below), whose sum is σ = 20262096. Its totient is φ = 19666020.

The previous prime is 19964033. The next prime is 19964059. The reversal of 19964057 is 75046991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75046991 = 3593 ⋅20887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19964057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19964059) 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, 148919 + ... + 149052.

It is an arithmetic number, because the mean of its divisors is an integer number (5065524).

Almost surely, 2^19964057 is an apocalyptic number.

It is an amenable number.

19964057 is a deficient number, since it is larger than the sum of its proper divisors (298039).

19964057 is an equidigital number, since it uses as much as digits as its factorization.

19964057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298038.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 19964057 is about 4468.1155983255. The cubic root of 19964057 is about 271.2790569650.

The spelling of 19964057 in words is "nineteen million, nine hundred sixty-four thousand, fifty-seven".