20938307 has 4 divisors (see below), whose sum is σ = 22548960. Its totient is φ = 19327656.

The previous prime is 20938297. The next prime is 20938367. The reversal of 20938307 is 70383902.

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 20938307 - 2¹⁰ = 20937283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20938367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805307 + ... + 805332.

It is an arithmetic number, because the mean of its divisors is an integer number (5637240).

Almost surely, 2^20938307 is an apocalyptic number.

20938307 is a deficient number, since it is larger than the sum of its proper divisors (1610653).

20938307 is a wasteful number, since it uses less digits than its factorization.

20938307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610652.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20938307 is about 4575.8394858212. The cubic root of 20938307 is about 275.6219838969.

The spelling of 20938307 in words is "twenty million, nine hundred thirty-eight thousand, three hundred seven".