20045915 has 16 divisors (see below), whose sum is σ = 24611040. Its totient is φ = 15671040.

The previous prime is 20045887. The next prime is 20045929. The reversal of 20045915 is 51954002.

It is not a de Polignac number, because 20045915 - 2¹⁴ = 20029531 is a prime.

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, 47405 + ... + 47825.

It is an arithmetic number, because the mean of its divisors is an integer number (1538190).

Almost surely, 2^20045915 is an apocalyptic number.

20045915 is a deficient number, since it is larger than the sum of its proper divisors (4565125).

20045915 is a wasteful number, since it uses less digits than its factorization.

20045915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20045915 is about 4477.2664651548. The cubic root of 20045915 is about 271.6493237117.

Adding to 20045915 its reverse (51954002), we get a palindrome (71999917).

The spelling of 20045915 in words is "twenty million, forty-five thousand, nine hundred fifteen".