20675902187 has 4 divisors (see below), whose sum is σ = 21574854480. Its totient is φ = 19776949896.

The previous prime is 20675902171. The next prime is 20675902223. The reversal of 20675902187 is 78120957602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20675902187 - 2⁴ = 20675902171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20675902787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449476112 + ... + 449476157.

It is an arithmetic number, because the mean of its divisors is an integer number (5393713620).

Almost surely, 2^20675902187 is an apocalyptic number.

20675902187 is a deficient number, since it is larger than the sum of its proper divisors (898952293).

20675902187 is an equidigital number, since it uses as much as digits as its factorization.

20675902187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898952292.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 20675902187 in words is "twenty billion, six hundred seventy-five million, nine hundred two thousand, one hundred eighty-seven".