20912093 has 4 divisors (see below), whose sum is σ = 20924640. Its totient is φ = 20899548.

The previous prime is 20912071. The next prime is 20912113. The reversal of 20912093 is 39021902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20912093 - 2⁶ = 20912029 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 (20912053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3305 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (5231160).

Almost surely, 2^20912093 is an apocalyptic number.

It is an amenable number.

20912093 is a deficient number, since it is larger than the sum of its proper divisors (12547).

20912093 is a wasteful number, since it uses less digits than its factorization.

20912093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12546.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20912093 is about 4572.9741962972. The cubic root of 20912093 is about 275.5069129570.

Adding to 20912093 its reverse (39021902), we get a palindrome (59933995).

The spelling of 20912093 in words is "twenty million, nine hundred twelve thousand, ninety-three".