20775147 has 4 divisors (see below), whose sum is σ = 27700200. Its totient is φ = 13850096.

The previous prime is 20775137. The next prime is 20775191. The reversal of 20775147 is 74157702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20775147 - 2¹⁴ = 20758763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20775127) 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, 3462522 + ... + 3462527.

It is an arithmetic number, because the mean of its divisors is an integer number (6925050).

Almost surely, 2^20775147 is an apocalyptic number.

20775147 is a deficient number, since it is larger than the sum of its proper divisors (6925053).

20775147 is an equidigital number, since it uses as much as digits as its factorization.

20775147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6925052.

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 20775147 is about 4557.9761956377. The cubic root of 20775147 is about 274.9041958288.

The spelling of 20775147 in words is "twenty million, seven hundred seventy-five thousand, one hundred forty-seven".