20580797687 has 4 divisors (see below), whose sum is σ = 20581627560. Its totient is φ = 20579967816.

The previous prime is 20580797681. The next prime is 20580797719. The reversal of 20580797687 is 78679708502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78679708502 = 2 ⋅39339854251.

It is a cyclic number.

It is not a de Polignac number, because 20580797687 - 2¹² = 20580793591 is a prime.

It is a super-3 number, since 3×20580797687³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20580797681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376553 + ... + 427730.

It is an arithmetic number, because the mean of its divisors is an integer number (5145406890).

Almost surely, 2^20580797687 is an apocalyptic number.

20580797687 is a deficient number, since it is larger than the sum of its proper divisors (829873).

20580797687 is an equidigital number, since it uses as much as digits as its factorization.

20580797687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829872.

The product of its (nonzero) digits is 11854080, while the sum is 59.

The spelling of 20580797687 in words is "twenty billion, five hundred eighty million, seven hundred ninety-seven thousand, six hundred eighty-seven".