20555361 has 12 divisors (see below), whose sum is σ = 30251988. Its totient is φ = 13444704.

The previous prime is 20555347. The next prime is 20555369. The reversal of 20555361 is 16355502.

It can be written as a sum of positive squares in 2 ways, for example, as 10595025 + 9960336 = 3255^2 + 3156^2 .

It is not a de Polignac number, because 20555361 - 2⁷ = 20555233 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21070 + ... + 22023.

It is an arithmetic number, because the mean of its divisors is an integer number (2520999).

Almost surely, 2^20555361 is an apocalyptic number.

It is an amenable number.

20555361 is a deficient number, since it is larger than the sum of its proper divisors (9696627).

20555361 is a wasteful number, since it uses less digits than its factorization.

20555361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43152 (or 43149 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 20555361 is about 4533.8020468477. The cubic root of 20555361 is about 273.9313279161.

The spelling of 20555361 in words is "twenty million, five hundred fifty-five thousand, three hundred sixty-one".