20997991922392 has 16 divisors (see below), whose sum is σ = 40286844968040. Its totient is φ = 10254833264256.

The previous prime is 20997991922387. The next prime is 20997991922431. The reversal of 20997991922392 is 29322919979902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30520336753 + ... + 30520337440.

Almost surely, 2^{20997991922392} is an apocalyptic number.

It is an amenable number.

20997991922392 is a deficient number, since it is larger than the sum of its proper divisors (19288853045648).

20997991922392 is a wasteful number, since it uses less digits than its factorization.

20997991922392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61040674242 (or 61040674238 counting only the distinct ones).

The product of its (nonzero) digits is 178564176, while the sum is 73.

The spelling of 20997991922392 in words is "twenty trillion, nine hundred ninety-seven billion, nine hundred ninety-one million, nine hundred twenty-two thousand, three hundred ninety-two".