20812093 has 8 divisors (see below), whose sum is σ = 21779928. Its totient is φ = 19865664.

The previous prime is 20812091. The next prime is 20812123. The reversal of 20812093 is 39021802.

It can be written as a sum of positive squares in 4 ways, for example, as 16662724 + 4149369 = 4082^2 + 2037^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20812093 - 2¹ = 20812091 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 (20812091) 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, 3346 + ... + 7267.

It is an arithmetic number, because the mean of its divisors is an integer number (2722491).

Almost surely, 2^20812093 is an apocalyptic number.

It is an amenable number.

20812093 is a deficient number, since it is larger than the sum of its proper divisors (967835).

20812093 is a wasteful number, since it uses less digits than its factorization.

20812093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20812093 is about 4562.0272905804. The cubic root of 20812093 is about 275.0670602297.

Adding to 20812093 its reverse (39021802), we get a palindrome (59833895).

The spelling of 20812093 in words is "twenty million, eight hundred twelve thousand, ninety-three".