19930931 has 4 divisors (see below), whose sum is σ = 19945392. Its totient is φ = 19916472.

The previous prime is 19930921. The next prime is 19930991. The reversal of 19930931 is 13903991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19930931 - 2²² = 15736627 is a prime.

It is a super-2 number, since 2×19930931² = 794484021053522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19930891 and 19930900.

It is not an unprimeable number, because it can be changed into a prime (19930921) 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, 4916 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (4986348).

Almost surely, 2^19930931 is an apocalyptic number.

19930931 is a deficient number, since it is larger than the sum of its proper divisors (14461).

19930931 is a wasteful number, since it uses less digits than its factorization.

19930931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14460.

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

The square root of 19930931 is about 4464.4071274918. The cubic root of 19930931 is about 271.1289310838.

The spelling of 19930931 in words is "nineteen million, nine hundred thirty thousand, nine hundred thirty-one".