20370016987 has 2 divisors, whose sum is σ = 20370016988. Its totient is φ = 20370016986.

The previous prime is 20370016973. The next prime is 20370017011. The reversal of 20370016987 is 78961007302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20370016987 - 2³¹ = 18222533339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20370016087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185008493 + 10185008494.

It is an arithmetic number, because the mean of its divisors is an integer number (10185008494).

Almost surely, 2^20370016987 is an apocalyptic number.

20370016987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20370016987 is an equidigital number, since it uses as much as digits as its factorization.

20370016987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 20370016987 in words is "twenty billion, three hundred seventy million, sixteen thousand, nine hundred eighty-seven".