20512541354551 has 4 divisors (see below), whose sum is σ = 20512938989952. Its totient is φ = 20512143719152.

The previous prime is 20512541354537. The next prime is 20512541354561. The reversal of 20512541354551 is 15545314521502.

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 20512541354551 - 2¹⁷ = 20512541223479 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20512541354498 and 20512541354507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512541354561) 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, 198740311 + ... + 198843496.

It is an arithmetic number, because the mean of its divisors is an integer number (5128234747488).

Almost surely, 2^{20512541354551} is an apocalyptic number.

20512541354551 is a deficient number, since it is larger than the sum of its proper divisors (397635401).

20512541354551 is an equidigital number, since it uses as much as digits as its factorization.

20512541354551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397635400.

The product of its (nonzero) digits is 600000, while the sum is 43.

The spelling of 20512541354551 in words is "twenty trillion, five hundred twelve billion, five hundred forty-one million, three hundred fifty-four thousand, five hundred fifty-one".