20636922812943 has 16 divisors (see below), whose sum is σ = 28036052366976. Its totient is φ = 13497889186080.

The previous prime is 20636922812897. The next prime is 20636922813097. The reversal of 20636922812943 is 34921822963602.

It is a Cunningham number, because it is equal to 4542788²-1.

It is not a de Polignac number, because 20636922812943 - 2²² = 20636918618639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636922812843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271396 + ... + 6814182.

It is an arithmetic number, because the mean of its divisors is an integer number (1752253272936).

Almost surely, 2^{20636922812943} is an apocalyptic number.

20636922812943 is a deficient number, since it is larger than the sum of its proper divisors (7399129554033).

20636922812943 is a wasteful number, since it uses less digits than its factorization.

20636922812943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571414.

The product of its (nonzero) digits is 13436928, while the sum is 57.

The spelling of 20636922812943 in words is "twenty trillion, six hundred thirty-six billion, nine hundred twenty-two million, eight hundred twelve thousand, nine hundred forty-three".