20045919 has 8 divisors (see below), whose sum is σ = 26748720. Its totient is φ = 13353536.

The previous prime is 20045887. The next prime is 20045929. The reversal of 20045919 is 91954002.

It is a happy number.

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 20045919 - 2⁵ = 20045887 is a prime.

It is a super-2 number, since 2×20045919² = 803677737109122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5437 + ... + 8345.

It is an arithmetic number, because the mean of its divisors is an integer number (3343590).

Almost surely, 2^20045919 is an apocalyptic number.

20045919 is a deficient number, since it is larger than the sum of its proper divisors (6702801).

20045919 is a wasteful number, since it uses less digits than its factorization.

20045919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20045919 is about 4477.2669118559. The cubic root of 20045919 is about 271.6493417802.

The spelling of 20045919 in words is "twenty million, forty-five thousand, nine hundred nineteen".