20824690987 has 2 divisors, whose sum is σ = 20824690988. Its totient is φ = 20824690986.

The previous prime is 20824690979. The next prime is 20824690993. The reversal of 20824690987 is 78909642802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20824690987 - 2³ = 20824690979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20824690687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10412345493 + 10412345494.

It is an arithmetic number, because the mean of its divisors is an integer number (10412345494).

Almost surely, 2^20824690987 is an apocalyptic number.

20824690987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20824690987 is an equidigital number, since it uses as much as digits as its factorization.

20824690987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 20824690987 in words is "twenty billion, eight hundred twenty-four million, six hundred ninety thousand, nine hundred eighty-seven".