20551093 has 4 divisors (see below), whose sum is σ = 20561580. Its totient is φ = 20540608.

The previous prime is 20551073. The next prime is 20551129. The reversal of 20551093 is 39015502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6240004 + 14311089 = 2498^2 + 3783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20551093 - 2⁵ = 20551061 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 (20551043) 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, 1330 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (5140395).

Almost surely, 2^20551093 is an apocalyptic number.

It is an amenable number.

20551093 is a deficient number, since it is larger than the sum of its proper divisors (10487).

20551093 is an equidigital number, since it uses as much as digits as its factorization.

20551093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20551093 is about 4533.3313357839. The cubic root of 20551093 is about 273.9123674150.

Adding to 20551093 its reverse (39015502), we get a palindrome (59566595).

The spelling of 20551093 in words is "twenty million, five hundred fifty-one thousand, ninety-three".