20938515 has 16 divisors (see below), whose sum is σ = 36079008. Its totient is φ = 10308096.

The previous prime is 20938507. The next prime is 20938529. The reversal of 20938515 is 51583902.

It is not a de Polignac number, because 20938515 - 2³ = 20938507 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53494 + ... + 53883.

It is an arithmetic number, because the mean of its divisors is an integer number (2254938).

Almost surely, 2^20938515 is an apocalyptic number.

20938515 is a deficient number, since it is larger than the sum of its proper divisors (15140493).

20938515 is a wasteful number, since it uses less digits than its factorization.

20938515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107398.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 20938515 is about 4575.8622138347. The cubic root of 20938515 is about 275.6228965651.

The spelling of 20938515 in words is "twenty million, nine hundred thirty-eight thousand, five hundred fifteen".