20042947 has 2 divisors, whose sum is σ = 20042948. Its totient is φ = 20042946.

The previous prime is 20042933. The next prime is 20042951. The reversal of 20042947 is 74924002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20042947 - 2¹¹ = 20040899 is a prime.

It is not a weakly prime, because it can be changed into another prime (20042917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021473 + 10021474.

It is an arithmetic number, because the mean of its divisors is an integer number (10021474).

Almost surely, 2^20042947 is an apocalyptic number.

20042947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042947 is an equidigital number, since it uses as much as digits as its factorization.

20042947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20042947 is about 4476.9350006450. The cubic root of 20042947 is about 271.6359162421.

Adding to 20042947 its reverse (74924002), we get a palindrome (94966949).

The spelling of 20042947 in words is "twenty million, forty-two thousand, nine hundred forty-seven".