20775361 has 4 divisors (see below), whose sum is σ = 20890324. Its totient is φ = 20660400.

The previous prime is 20775331. The next prime is 20775383. The reversal of 20775361 is 16357702.

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 118336 + 20657025 = 344^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20775361 - 2⁵ = 20775329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20775331) 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, 57210 + ... + 57571.

It is an arithmetic number, because the mean of its divisors is an integer number (5222581).

Almost surely, 2^20775361 is an apocalyptic number.

It is an amenable number.

20775361 is a deficient number, since it is larger than the sum of its proper divisors (114963).

20775361 is a wasteful number, since it uses less digits than its factorization.

20775361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114962.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 20775361 is about 4557.9996709083. Note that the first 3 decimals coincide. The cubic root of 20775361 is about 274.9051397338.

The spelling of 20775361 in words is "twenty million, seven hundred seventy-five thousand, three hundred sixty-one".