19725564 has 12 divisors (see below), whose sum is σ = 46026344. Its totient is φ = 6575184.

The previous prime is 19725533. The next prime is 19725599. The reversal of 19725564 is 46552791.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821887 + ... + 821910.

Almost surely, 2^19725564 is an apocalyptic number.

It is an amenable number.

19725564 is an abundant number, since it is smaller than the sum of its proper divisors (26300780).

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

19725564 is a wasteful number, since it uses less digits than its factorization.

19725564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643804 (or 1643802 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The square root of 19725564 is about 4441.3470929438. The cubic root of 19725564 is about 270.1944826502.

The spelling of 19725564 in words is "nineteen million, seven hundred twenty-five thousand, five hundred sixty-four".