20937893 has 4 divisors (see below), whose sum is σ = 21503820. Its totient is φ = 20371968.

The previous prime is 20937881. The next prime is 20937901. The reversal of 20937893 is 39873902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39873902 = 2 ⋅19936951.

It can be written as a sum of positive squares in 2 ways, for example, as 14876449 + 6061444 = 3857^2 + 2462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20937893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20937893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937853) 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, 282908 + ... + 282981.

It is an arithmetic number, because the mean of its divisors is an integer number (5375955).

Almost surely, 2^20937893 is an apocalyptic number.

It is an amenable number.

20937893 is a deficient number, since it is larger than the sum of its proper divisors (565927).

20937893 is an equidigital number, since it uses as much as digits as its factorization.

20937893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565926.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20937893 is about 4575.7942479967. The cubic root of 20937893 is about 275.6201673181.

The spelling of 20937893 in words is "twenty million, nine hundred thirty-seven thousand, eight hundred ninety-three".