19947057 has 8 divisors (see below), whose sum is σ = 28641984. Its totient is φ = 12275088.

The previous prime is 19947029. The next prime is 19947071. The reversal of 19947057 is 75074991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19947057 - 2¹⁰ = 19946033 is a prime.

It is a super-2 number, since 2×19947057² = 795770165922498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19947457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255693 + ... + 255770.

It is an arithmetic number, because the mean of its divisors is an integer number (3580248).

Almost surely, 2^19947057 is an apocalyptic number.

It is an amenable number.

19947057 is a deficient number, since it is larger than the sum of its proper divisors (8694927).

19947057 is a wasteful number, since it uses less digits than its factorization.

19947057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511479.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 19947057 is about 4466.2128252021. The cubic root of 19947057 is about 271.2020343170.

The spelling of 19947057 in words is "nineteen million, nine hundred forty-seven thousand, fifty-seven".