19715964 has 12 divisors (see below), whose sum is σ = 46003944. Its totient is φ = 6571984.

The previous prime is 19715963. The next prime is 19715987. The reversal of 19715964 is 46951791.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19715963) 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, 821487 + ... + 821510.

It is an arithmetic number, because the mean of its divisors is an integer number (3833662).

Almost surely, 2^19715964 is an apocalyptic number.

It is an amenable number.

19715964 is an abundant number, since it is smaller than the sum of its proper divisors (26287980).

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

19715964 is a wasteful number, since it uses less digits than its factorization.

19715964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643004 (or 1643002 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 19715964 is about 4440.2662082357. The cubic root of 19715964 is about 270.1506429584.

It can be divided in two parts, 197 and 15964, that added together give a palindrome (16161).

The spelling of 19715964 in words is "nineteen million, seven hundred fifteen thousand, nine hundred sixty-four".