20312912338 has 4 divisors (see below), whose sum is σ = 30469368510. Its totient is φ = 10156456168.

The previous prime is 20312912327. The next prime is 20312912351. The reversal of 20312912338 is 83321921302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83321921302 = 2 ⋅41660960651.

It can be written as a sum of positive squares in only one way, i.e., 18985257369 + 1327654969 = 137787^2 + 36437^2 .

It is a super-2 number, since 2×20312912338² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5078228083 + ... + 5078228086.

Almost surely, 2^20312912338 is an apocalyptic number.

20312912338 is a deficient number, since it is larger than the sum of its proper divisors (10156456172).

20312912338 is a wasteful number, since it uses less digits than its factorization.

20312912338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156456171.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20312912338 in words is "twenty billion, three hundred twelve million, nine hundred twelve thousand, three hundred thirty-eight".