19725081 has 8 divisors (see below), whose sum is σ = 26413920. Its totient is φ = 13093152.

The previous prime is 19725077. The next prime is 19725091. The reversal of 19725081 is 18052791.

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

It is not a de Polignac number, because 19725081 - 2² = 19725077 is a prime.

It is a super-2 number, since 2×19725081² = 778157640913122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19725011) 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, 13411 + ... + 14808.

It is an arithmetic number, because the mean of its divisors is an integer number (3301740).

Almost surely, 2^19725081 is an apocalyptic number.

It is an amenable number.

19725081 is a deficient number, since it is larger than the sum of its proper divisors (6688839).

19725081 is a wasteful number, since it uses less digits than its factorization.

19725081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28455.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 19725081 is about 4441.2927172165. The cubic root of 19725081 is about 270.1922773056.

The spelling of 19725081 in words is "nineteen million, seven hundred twenty-five thousand, eighty-one".