20042345 has 16 divisors (see below), whose sum is σ = 24919488. Its totient is φ = 15462720.

The previous prime is 20042327. The next prime is 20042353. The reversal of 20042345 is 54324002.

It is a de Polignac number, because none of the positive numbers 2^k-20042345 is a prime.

It is a Duffinian 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, 23822 + ... + 24648.

It is an arithmetic number, because the mean of its divisors is an integer number (1557468).

Almost surely, 2^20042345 is an apocalyptic number.

It is an amenable number.

20042345 is a deficient number, since it is larger than the sum of its proper divisors (4877143).

20042345 is a wasteful number, since it uses less digits than its factorization.

20042345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20042345 is about 4476.8677666422. The cubic root of 20042345 is about 271.6331966410.

Adding to 20042345 its reverse (54324002), we get a palindrome (74366347).

The spelling of 20042345 in words is "twenty million, forty-two thousand, three hundred forty-five".