20308106187 has 8 divisors (see below), whose sum is σ = 30086083280. Its totient is φ = 13538737440.

The previous prime is 20308106179. The next prime is 20308106191. The reversal of 20308106187 is 78160180302.

20308106187 is a `hidden beast` number, since 2 + 0 + 30 + 8 + 1 + 0 + 618 + 7 = 666.

It is not a de Polignac number, because 20308106187 - 2³ = 20308106179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20307106187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376076014 + ... + 376076067.

It is an arithmetic number, because the mean of its divisors is an integer number (3760760410).

Almost surely, 2^20308106187 is an apocalyptic number.

20308106187 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20308106187 is a deficient number, since it is larger than the sum of its proper divisors (9777977093).

20308106187 is an equidigital number, since it uses as much as digits as its factorization.

20308106187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752152090 (or 752152084 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

Adding to 20308106187 its reverse (78160180302), we get a palindrome (98468286489).

The spelling of 20308106187 in words is "twenty billion, three hundred eight million, one hundred six thousand, one hundred eighty-seven".