20543413540551 has 8 divisors (see below), whose sum is σ = 29881328786304. Its totient is φ = 12450553660920.

The previous prime is 20543413540549. The next prime is 20543413540589. The reversal of 20543413540551 is 15504531434502.

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

It is not a de Polignac number, because 20543413540551 - 2¹ = 20543413540549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543413540511) 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, 311263841491 + ... + 311263841556.

It is an arithmetic number, because the mean of its divisors is an integer number (3735166098288).

Almost surely, 2^{20543413540551} is an apocalyptic number.

20543413540551 is a deficient number, since it is larger than the sum of its proper divisors (9337915245753).

20543413540551 is a wasteful number, since it uses less digits than its factorization.

20543413540551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622527683061.

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 20543413540551 in words is "twenty trillion, five hundred forty-three billion, four hundred thirteen million, five hundred forty thousand, five hundred fifty-one".