20993577243 has 8 divisors (see below), whose sum is σ = 28519576848. Its totient is φ = 13731647904.

The previous prime is 20993577211. The next prime is 20993577251. The reversal of 20993577243 is 34277539902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20993577243 - 2⁵ = 20993577211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20993577043) 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, 66017380 + ... + 66017697.

It is an arithmetic number, because the mean of its divisors is an integer number (3564947106).

Almost surely, 2^20993577243 is an apocalyptic number.

20993577243 is a deficient number, since it is larger than the sum of its proper divisors (7525999605).

20993577243 is a wasteful number, since it uses less digits than its factorization.

20993577243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132035133.

The product of its (nonzero) digits is 2857680, while the sum is 51.

The spelling of 20993577243 in words is "twenty billion, nine hundred ninety-three million, five hundred seventy-seven thousand, two hundred forty-three".