20982915 has 32 divisors (see below), whose sum is σ = 38108160. Its totient is φ = 10949472.

The previous prime is 20982889. The next prime is 20982931. The reversal of 20982915 is 51928902.

It is not a de Polignac number, because 20982915 - 2⁸ = 20982659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20982915.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4692 + ... + 7998.

It is an arithmetic number, because the mean of its divisors is an integer number (1190880).

Almost surely, 2^20982915 is an apocalyptic number.

20982915 is a deficient number, since it is larger than the sum of its proper divisors (17125245).

20982915 is a wasteful number, since it uses less digits than its factorization.

20982915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20982915 is about 4580.7111893242. The cubic root of 20982915 is about 275.8175779425.

The spelling of 20982915 in words is "twenty million, nine hundred eighty-two thousand, nine hundred fifteen".