20045019 has 8 divisors (see below), whose sum is σ = 28133440. Its totient is φ = 12659976.

The previous prime is 20045017. The next prime is 20045063. The reversal of 20045019 is 91054002.

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

It is not a de Polignac number, because 20045019 - 2¹ = 20045017 is a prime.

It is a super-2 number, since 2×20045019² = 803605573420722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20044986 and 20045004.

It is not an unprimeable number, because it can be changed into a prime (20045017) 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, 175777 + ... + 175890.

It is an arithmetic number, because the mean of its divisors is an integer number (3516680).

Almost surely, 2^20045019 is an apocalyptic number.

20045019 is a deficient number, since it is larger than the sum of its proper divisors (8088421).

20045019 is a wasteful number, since it uses less digits than its factorization.

20045019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351689.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20045019 is about 4477.1664029830. The cubic root of 20045019 is about 271.6452763132.

The spelling of 20045019 in words is "twenty million, forty-five thousand, nineteen".