20509093 has 4 divisors (see below), whose sum is σ = 22373568. Its totient is φ = 18644620.

The previous prime is 20509081. The next prime is 20509109. The reversal of 20509093 is 39090502.

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 20509093 - 2¹³ = 20500901 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 (20509793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932221 + ... + 932242.

It is an arithmetic number, because the mean of its divisors is an integer number (5593392).

Almost surely, 2^20509093 is an apocalyptic number.

It is an amenable number.

20509093 is a deficient number, since it is larger than the sum of its proper divisors (1864475).

20509093 is a wasteful number, since it uses less digits than its factorization.

20509093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864474.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 20509093 is about 4528.6966116091. The cubic root of 20509093 is about 273.7256431141.

Adding to 20509093 its reverse (39090502), we get a palindrome (59599595).

The spelling of 20509093 in words is "twenty million, five hundred nine thousand, ninety-three".