20409293 has 4 divisors (see below), whose sum is σ = 20794428. Its totient is φ = 20024160.

The previous prime is 20409283. The next prime is 20409317. The reversal of 20409293 is 39290402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 3087049 = 4162^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 20409293 - 2⁶ = 20409229 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 (20409203) 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, 192488 + ... + 192593.

It is an arithmetic number, because the mean of its divisors is an integer number (5198607).

Almost surely, 2^20409293 is an apocalyptic number.

It is an amenable number.

20409293 is a deficient number, since it is larger than the sum of its proper divisors (385135).

20409293 is an equidigital number, since it uses as much as digits as its factorization.

20409293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385134.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20409293 is about 4517.6645515133. The cubic root of 20409293 is about 273.2809257378.

Adding to 20409293 its reverse (39290402), we get a palindrome (59699695).

It can be divided in two parts, 20409 and 293, that added together give a palindrome (20702).

The spelling of 20409293 in words is "twenty million, four hundred nine thousand, two hundred ninety-three".