20479741987 has 2 divisors, whose sum is σ = 20479741988. Its totient is φ = 20479741986.

The previous prime is 20479741981. The next prime is 20479741991. The reversal of 20479741987 is 78914797402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20479741987 - 2²³ = 20471353379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20479741981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10239870993 + 10239870994.

It is an arithmetic number, because the mean of its divisors is an integer number (10239870994).

Almost surely, 2^20479741987 is an apocalyptic number.

20479741987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20479741987 is an equidigital number, since it uses as much as digits as its factorization.

20479741987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 20479741987 in words is "twenty billion, four hundred seventy-nine million, seven hundred forty-one thousand, nine hundred eighty-seven".