20065915 has 4 divisors (see below), whose sum is σ = 24079104. Its totient is φ = 16052728.

The previous prime is 20065909. The next prime is 20065931. The reversal of 20065915 is 51956002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20065915 - 2²¹ = 17968763 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006587 + ... + 2006596.

It is an arithmetic number, because the mean of its divisors is an integer number (6019776).

Almost surely, 2^20065915 is an apocalyptic number.

20065915 is a deficient number, since it is larger than the sum of its proper divisors (4013189).

20065915 is an equidigital number, since it uses as much as digits as its factorization.

20065915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013188.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 20065915 is about 4479.4994139971. The cubic root of 20065915 is about 271.7396360542.

It can be divided in two parts, 2006 and 5915, that added together give a square (7921 = 89²).

The spelling of 20065915 in words is "twenty million, sixty-five thousand, nine hundred fifteen".