20968915 has 8 divisors (see below), whose sum is σ = 27450288. Its totient is φ = 15250080.

The previous prime is 20968901. The next prime is 20968949. The reversal of 20968915 is 51986902.

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

It is not a de Polignac number, because 20968915 - 2⁹ = 20968403 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190572 + ... + 190681.

It is an arithmetic number, because the mean of its divisors is an integer number (3431286).

Almost surely, 2^20968915 is an apocalyptic number.

20968915 is a deficient number, since it is larger than the sum of its proper divisors (6481373).

20968915 is a wasteful number, since it uses less digits than its factorization.

20968915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381269.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20968915 is about 4579.1827873541. The cubic root of 20968915 is about 275.7562215929.

It can be divided in two parts, 2096 and 8915, that added together give a palindrome (11011).

The spelling of 20968915 in words is "twenty million, nine hundred sixty-eight thousand, nine hundred fifteen".