20311210987 has 2 divisors, whose sum is σ = 20311210988. Its totient is φ = 20311210986.

The previous prime is 20311210979. The next prime is 20311210993. The reversal of 20311210987 is 78901211302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20311210987 - 2³ = 20311210979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20311219987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155605493 + 10155605494.

It is an arithmetic number, because the mean of its divisors is an integer number (10155605494).

Almost surely, 2^20311210987 is an apocalyptic number.

20311210987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311210987 is an equidigital number, since it uses as much as digits as its factorization.

20311210987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 20311210987 in words is "twenty billion, three hundred eleven million, two hundred ten thousand, nine hundred eighty-seven".