20993174213 has 4 divisors (see below), whose sum is σ = 22901644608. Its totient is φ = 19084703820.

The previous prime is 20993174203. The next prime is 20993174221. The reversal of 20993174213 is 31247139902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20993174213 - 2¹⁰ = 20993173189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993174203) 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, 954235181 + ... + 954235202.

It is an arithmetic number, because the mean of its divisors is an integer number (5725411152).

Almost surely, 2^20993174213 is an apocalyptic number.

It is an amenable number.

20993174213 is a deficient number, since it is larger than the sum of its proper divisors (1908470395).

20993174213 is a wasteful number, since it uses less digits than its factorization.

20993174213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908470394.

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 20993174213 in words is "twenty billion, nine hundred ninety-three million, one hundred seventy-four thousand, two hundred thirteen".