19947245 has 8 divisors (see below), whose sum is σ = 25196640. Its totient is φ = 15117840.

The previous prime is 19947209. The next prime is 19947247. The reversal of 19947245 is 54274991.

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

It is not a de Polignac number, because 19947245 - 2⁸ = 19946989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19947247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104891 + ... + 105080.

It is an arithmetic number, because the mean of its divisors is an integer number (3149580).

Almost surely, 2^19947245 is an apocalyptic number.

It is an amenable number.

19947245 is a deficient number, since it is larger than the sum of its proper divisors (5249395).

19947245 is a wasteful number, since it uses less digits than its factorization.

19947245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209995.

The product of its digits is 90720, while the sum is 41.

The square root of 19947245 is about 4466.2338720672. The cubic root of 19947245 is about 271.2028863361.

The spelling of 19947245 in words is "nineteen million, nine hundred forty-seven thousand, two hundred forty-five".