19930913 has 4 divisors (see below), whose sum is σ = 19970580. Its totient is φ = 19891248.

The previous prime is 19930891. The next prime is 19930921. The reversal of 19930913 is 31903991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16589329 + 3341584 = 4073^2 + 1828^2 .

It is a cyclic number.

It is not a de Polignac number, because 19930913 - 2¹⁴ = 19914529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19530913) 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, 19070 + ... + 20087.

It is an arithmetic number, because the mean of its divisors is an integer number (4992645).

Almost surely, 2^19930913 is an apocalyptic number.

It is an amenable number.

19930913 is a deficient number, since it is larger than the sum of its proper divisors (39667).

19930913 is an equidigital number, since it uses as much as digits as its factorization.

19930913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39666.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 19930913 is about 4464.4051115462. The cubic root of 19930913 is about 271.1288494632.

The spelling of 19930913 in words is "nineteen million, nine hundred thirty thousand, nine hundred thirteen".