19928005 has 16 divisors (see below), whose sum is σ = 25142400. Its totient is φ = 15133888.

The previous prime is 19927997. The next prime is 19928023. The reversal of 19928005 is 50082991.

It is a cyclic number.

It is not a de Polignac number, because 19928005 - 2³ = 19927997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16554 + ... + 17716.

It is an arithmetic number, because the mean of its divisors is an integer number (1571400).

Almost surely, 2^19928005 is an apocalyptic number.

It is an amenable number.

19928005 is a deficient number, since it is larger than the sum of its proper divisors (5214395).

19928005 is a wasteful number, since it uses less digits than its factorization.

19928005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 19928005 is about 4464.0794123761. The cubic root of 19928005 is about 271.1156625603.

The spelling of 19928005 in words is "nineteen million, nine hundred twenty-eight thousand, five".