19704961 has 4 divisors (see below), whose sum is σ = 19781892. Its totient is φ = 19628032.

The previous prime is 19704959. The next prime is 19704973. The reversal of 19704961 is 16940791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16940791 = 7 ⋅2420113.

It can be written as a sum of positive squares in 2 ways, for example, as 10890000 + 8814961 = 3300^2 + 2969^2 .

It is a cyclic number.

It is not a de Polignac number, because 19704961 - 2¹ = 19704959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19704961.

It is not an unprimeable number, because it can be changed into a prime (19704931) 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, 38080 + ... + 38593.

It is an arithmetic number, because the mean of its divisors is an integer number (4945473).

Almost surely, 2^19704961 is an apocalyptic number.

It is an amenable number.

19704961 is a deficient number, since it is larger than the sum of its proper divisors (76931).

19704961 is an equidigital number, since it uses as much as digits as its factorization.

19704961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76930.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 19704961 is about 4439.0270330333. The cubic root of 19704961 is about 270.1003787723.

The spelling of 19704961 in words is "nineteen million, seven hundred four thousand, nine hundred sixty-one".