20774147 has 2 divisors, whose sum is σ = 20774148. Its totient is φ = 20774146.

The previous prime is 20774101. The next prime is 20774161. The reversal of 20774147 is 74147702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20774147 - 2²⁴ = 3996931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20774177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387073 + 10387074.

It is an arithmetic number, because the mean of its divisors is an integer number (10387074).

Almost surely, 2^20774147 is an apocalyptic number.

20774147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20774147 is an equidigital number, since it uses as much as digits as its factorization.

20774147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 20774147 is about 4557.8664965091. The cubic root of 20774147 is about 274.8997849719.

The spelling of 20774147 in words is "twenty million, seven hundred seventy-four thousand, one hundred forty-seven".