20840131588551 has 8 divisors (see below), whose sum is σ = 30312918674304. Its totient is φ = 12630382780920.

The previous prime is 20840131588541. The next prime is 20840131588571. The reversal of 20840131588551 is 15588513104802.

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

It is not a de Polignac number, because 20840131588551 - 2²⁷ = 20839997370823 is a prime.

It is a super-3 number, since 3×20840131588551³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20840131588494 and 20840131588503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840131588541) 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, 315759569491 + ... + 315759569556.

It is an arithmetic number, because the mean of its divisors is an integer number (3789114834288).

Almost surely, 2^{20840131588551} is an apocalyptic number.

20840131588551 is a deficient number, since it is larger than the sum of its proper divisors (9472787085753).

20840131588551 is a wasteful number, since it uses less digits than its factorization.

20840131588551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631519139061.

The product of its (nonzero) digits is 1536000, while the sum is 51.

The spelling of 20840131588551 in words is "twenty trillion, eight hundred forty billion, one hundred thirty-one million, five hundred eighty-eight thousand, five hundred fifty-one".