20328919 has 8 divisors (see below), whose sum is σ = 21936992. Its totient is φ = 18727200.

The previous prime is 20328911. The next prime is 20328929. The reversal of 20328919 is 91982302.

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 20328919 - 2³ = 20328911 is a prime.

It is a super-2 number, since 2×20328919² = 826529895417122, 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 (20328911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6694 + ... + 9244.

It is an arithmetic number, because the mean of its divisors is an integer number (2742124).

Almost surely, 2^20328919 is an apocalyptic number.

20328919 is a deficient number, since it is larger than the sum of its proper divisors (1608073).

20328919 is a wasteful number, since it uses less digits than its factorization.

20328919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20328919 is about 4508.7602508894. The cubic root of 20328919 is about 272.9217171906.

The spelling of 20328919 in words is "twenty million, three hundred twenty-eight thousand, nine hundred nineteen".