20774947 has 2 divisors, whose sum is σ = 20774948. Its totient is φ = 20774946.

The previous prime is 20774939. The next prime is 20774951. The reversal of 20774947 is 74947702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20774947 - 2³ = 20774939 is a prime.

It is not a weakly prime, because it can be changed into another prime (20774917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387473 + 10387474.

It is an arithmetic number, because the mean of its divisors is an integer number (10387474).

Almost surely, 2^20774947 is an apocalyptic number.

20774947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20774947 is an equidigital number, since it uses as much as digits as its factorization.

20774947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 20774947 is about 4557.9542560232. The cubic root of 20774947 is about 274.9033136688.

The spelling of 20774947 in words is "twenty million, seven hundred seventy-four thousand, nine hundred forty-seven".