19930207 has 4 divisors (see below), whose sum is σ = 21742056. Its totient is φ = 18118360.

The previous prime is 19930201. The next prime is 19930217. The reversal of 19930207 is 70203991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19930207 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19930201) 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, 905908 + ... + 905929.

It is an arithmetic number, because the mean of its divisors is an integer number (5435514).

Almost surely, 2^19930207 is an apocalyptic number.

19930207 is a deficient number, since it is larger than the sum of its proper divisors (1811849).

19930207 is a wasteful number, since it uses less digits than its factorization.

19930207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811848.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 19930207 is about 4464.3260409607. The cubic root of 19930207 is about 271.1256480841.

The spelling of 19930207 in words is "nineteen million, nine hundred thirty thousand, two hundred seven".