20312302138 has 4 divisors (see below), whose sum is σ = 30468453210. Its totient is φ = 10156151068.

The previous prime is 20312302111. The next prime is 20312302139. The reversal of 20312302138 is 83120321302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83120321302 = 2 ⋅41560160651.

It can be written as a sum of positive squares in only one way, i.e., 18582324489 + 1729977649 = 136317^2 + 41593^2 .

It is not an unprimeable number, because it can be changed into a prime (20312302139) 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 as a sum of consecutive naturals, namely, 5078075533 + ... + 5078075536.

Almost surely, 2^20312302138 is an apocalyptic number.

20312302138 is a deficient number, since it is larger than the sum of its proper divisors (10156151072).

20312302138 is a wasteful number, since it uses less digits than its factorization.

20312302138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156151071.

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 20312302138 in words is "twenty billion, three hundred twelve million, three hundred two thousand, one hundred thirty-eight".