19997064 has 64 divisors (see below), whose sum is σ = 56865600. Its totient is φ = 6507648.

The previous prime is 19997041. The next prime is 19997069. The reversal of 19997064 is 46079991.

It is not an unprimeable number, because it can be changed into a prime (19997069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8212 + ... + 10364.

It is an arithmetic number, because the mean of its divisors is an integer number (888525).

Almost surely, 2^19997064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19997064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28432800).

19997064 is an abundant number, since it is smaller than the sum of its proper divisors (36868536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19997064 is a wasteful number, since it uses less digits than its factorization.

19997064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19997064 is about 4471.8076881726. The cubic root of 19997064 is about 271.4284784593.

The spelling of 19997064 in words is "nineteen million, nine hundred ninety-seven thousand, sixty-four".