20938351 has 4 divisors (see below), whose sum is σ = 23929552. Its totient is φ = 17947152.

The previous prime is 20938297. The next prime is 20938367. The reversal of 20938351 is 15383902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15383902 = 2 ⋅7691951.

It is a cyclic number.

It is not a de Polignac number, because 20938351 - 2¹¹ = 20936303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20938751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1495590 + ... + 1495603.

It is an arithmetic number, because the mean of its divisors is an integer number (5982388).

Almost surely, 2^20938351 is an apocalyptic number.

20938351 is a deficient number, since it is larger than the sum of its proper divisors (2991201).

20938351 is an equidigital number, since it uses as much as digits as its factorization.

20938351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991200.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20938351 is about 4575.8442936796. The cubic root of 20938351 is about 275.6221769618.

The spelling of 20938351 in words is "twenty million, nine hundred thirty-eight thousand, three hundred fifty-one".