20938915 has 8 divisors (see below), whose sum is σ = 25164288. Its totient is φ = 16726080.

The previous prime is 20938903. The next prime is 20938927. The reversal of 20938915 is 51983902.

It is an interprime number because it is at equal distance from previous prime (20938903) and next prime (20938927).

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

It is not a de Polignac number, because 20938915 - 2⁹ = 20938403 is a prime.

It is a super-2 number, since 2×20938915² = 876876322754450, which contains 22 as substring.

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, 1054 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (3145536).

Almost surely, 2^20938915 is an apocalyptic number.

20938915 is a deficient number, since it is larger than the sum of its proper divisors (4225373).

20938915 is an equidigital number, since it uses as much as digits as its factorization.

20938915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6269.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 20938915 is about 4575.9059212357. The cubic root of 20938915 is about 275.6246516793.

The spelling of 20938915 in words is "twenty million, nine hundred thirty-eight thousand, nine hundred fifteen".