20587077821693 has 4 divisors (see below), whose sum is σ = 20610287605920. Its totient is φ = 20563868037468.

The previous prime is 20587077821671. The next prime is 20587077821707. The reversal of 20587077821693 is 39612877078502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20587077821693 - 2³² = 20582782854397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20587077871693) 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, 11604890783 + ... + 11604892556.

It is an arithmetic number, because the mean of its divisors is an integer number (5152571901480).

Almost surely, 2^{20587077821693} is an apocalyptic number.

It is an amenable number.

20587077821693 is a deficient number, since it is larger than the sum of its proper divisors (23209784227).

20587077821693 is an equidigital number, since it uses as much as digits as its factorization.

20587077821693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23209784226.

The product of its (nonzero) digits is 71124480, while the sum is 65.

The spelling of 20587077821693 in words is "twenty trillion, five hundred eighty-seven billion, seventy-seven million, eight hundred twenty-one thousand, six hundred ninety-three".