19928931 has 8 divisors (see below), whose sum is σ = 28987584. Its totient is φ = 12078120.

The previous prime is 19928921. The next prime is 19928959. The reversal of 19928931 is 13982991.

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

It is not a de Polignac number, because 19928931 - 2⁷ = 19928803 is a prime.

It is a super-2 number, since 2×19928931² = 794324581605522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19928921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301921 + ... + 301986.

It is an arithmetic number, because the mean of its divisors is an integer number (3623448).

Almost surely, 2^19928931 is an apocalyptic number.

19928931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19928931 is a deficient number, since it is larger than the sum of its proper divisors (9058653).

19928931 is a wasteful number, since it uses less digits than its factorization.

19928931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603921.

The product of its digits is 34992, while the sum is 42.

The square root of 19928931 is about 4464.1831279642. The cubic root of 19928931 is about 271.1198618302.

The spelling of 19928931 in words is "nineteen million, nine hundred twenty-eight thousand, nine hundred thirty-one".