20020209947 has 2 divisors, whose sum is σ = 20020209948. Its totient is φ = 20020209946.

The previous prime is 20020209929. The next prime is 20020209971. The reversal of 20020209947 is 74990202002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20020209947 - 2⁸ = 20020209691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020209917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010104973 + 10010104974.

It is an arithmetic number, because the mean of its divisors is an integer number (10010104974).

Almost surely, 2^20020209947 is an apocalyptic number.

20020209947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020209947 is an equidigital number, since it uses as much as digits as its factorization.

20020209947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 20020209947 in words is "twenty billion, twenty million, two hundred nine thousand, nine hundred forty-seven".