19928845 has 8 divisors (see below), whose sum is σ = 25321464. Its totient is φ = 15005184.

The previous prime is 19928837. The next prime is 19928861. The reversal of 19928845 is 54882991.

It can be written as a sum of positive squares in 4 ways, for example, as 1798281 + 18130564 = 1341^2 + 4258^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19928845 - 2³ = 19928837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19928795 and 19928804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117144 + ... + 117313.

It is an arithmetic number, because the mean of its divisors is an integer number (3165183).

Almost surely, 2^19928845 is an apocalyptic number.

It is an amenable number.

19928845 is a deficient number, since it is larger than the sum of its proper divisors (5392619).

19928845 is a wasteful number, since it uses less digits than its factorization.

19928845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234479.

The product of its digits is 207360, while the sum is 46.

The square root of 19928845 is about 4464.1734957324. The cubic root of 19928845 is about 271.1194718387.

The spelling of 19928845 in words is "nineteen million, nine hundred twenty-eight thousand, eight hundred forty-five".