19928623 has 8 divisors (see below), whose sum is σ = 23412816. Its totient is φ = 16723200.

The previous prime is 19928621. The next prime is 19928633. The reversal of 19928623 is 32682991.

It is a happy number.

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

It is not a de Polignac number, because 19928623 - 2¹ = 19928621 is a prime.

It is a super-2 number, since 2×19928623² = 794300029352258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928621) 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, 69538 + ... + 69823.

It is an arithmetic number, because the mean of its divisors is an integer number (2926602).

Almost surely, 2^19928623 is an apocalyptic number.

19928623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19928623 is a deficient number, since it is larger than the sum of its proper divisors (3484193).

19928623 is a wasteful number, since it uses less digits than its factorization.

19928623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139385.

The product of its digits is 46656, while the sum is 40.

The square root of 19928623 is about 4464.1486310382. The cubic root of 19928623 is about 271.1184651113.

The spelling of 19928623 in words is "nineteen million, nine hundred twenty-eight thousand, six hundred twenty-three".