20993365 has 12 divisors (see below), whose sum is σ = 26338284. Its totient is φ = 16062464.

The previous prime is 20993359. The next prime is 20993369. The reversal of 20993365 is 56339902.

It can be written as a sum of positive squares in 2 ways, for example, as 16016004 + 4977361 = 4002^2 + 2231^2 .

It is not a de Polignac number, because 20993365 - 2⁷ = 20993237 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1324 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (2194857).

Almost surely, 2^20993365 is an apocalyptic number.

It is an amenable number.

20993365 is a deficient number, since it is larger than the sum of its proper divisors (5344919).

20993365 is an equidigital number, since it uses as much as digits as its factorization.

20993365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7988 (or 7965 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 20993365 is about 4581.8516999135. The cubic root of 20993365 is about 275.8633582887.

The spelling of 20993365 in words is "twenty million, nine hundred ninety-three thousand, three hundred sixty-five".