20043656122051 has 4 divisors (see below), whose sum is σ = 20372240648704. Its totient is φ = 19715071595400.

The previous prime is 20043656121989. The next prime is 20043656122069. The reversal of 20043656122051 is 15022165634002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20043656122051 - 2³⁹ = 19493900308163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20043656122051.

It is not an unprimeable number, because it can be changed into a prime (20043656128051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164292263235 + ... + 164292263356.

It is an arithmetic number, because the mean of its divisors is an integer number (5093060162176).

Almost surely, 2^{20043656122051} is an apocalyptic number.

20043656122051 is a deficient number, since it is larger than the sum of its proper divisors (328584526653).

20043656122051 is an equidigital number, since it uses as much as digits as its factorization.

20043656122051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328584526652.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20043656122051 in words is "twenty trillion, forty-three billion, six hundred fifty-six million, one hundred twenty-two thousand, fifty-one".