20939337 has 8 divisors (see below), whose sum is σ = 31021280. Its totient is φ = 13959540.

The previous prime is 20939333. The next prime is 20939341. The reversal of 20939337 is 73393902.

It is an interprime number because it is at equal distance from previous prime (20939333) and next prime (20939341).

It is not a de Polignac number, because 20939337 - 2² = 20939333 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20939333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387739 + ... + 387792.

It is an arithmetic number, because the mean of its divisors is an integer number (3877660).

Almost surely, 2^20939337 is an apocalyptic number.

20939337 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20939337 is a deficient number, since it is larger than the sum of its proper divisors (10081943).

20939337 is an equidigital number, since it uses as much as digits as its factorization.

20939337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775540 (or 775534 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 36.

The square root of 20939337 is about 4575.9520320912. The cubic root of 20939337 is about 275.6265033006.

The spelling of 20939337 in words is "twenty million, nine hundred thirty-nine thousand, three hundred thirty-seven".