20587212361 has 4 divisors (see below), whose sum is σ = 20587675392. Its totient is φ = 20586749332.

The previous prime is 20587212353. The next prime is 20587212403. The reversal of 20587212361 is 16321278502.

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 20587212361 - 2³ = 20587212353 is a prime.

It is a super-2 number, since 2×20587212361² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20587212361.

It is not an unprimeable number, because it can be changed into a prime (20587212461) 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, 156781 + ... + 256426.

It is an arithmetic number, because the mean of its divisors is an integer number (5146918848).

Almost surely, 2^20587212361 is an apocalyptic number.

It is an amenable number.

20587212361 is a deficient number, since it is larger than the sum of its proper divisors (463031).

20587212361 is an equidigital number, since it uses as much as digits as its factorization.

20587212361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463030.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 20587212361 in words is "twenty billion, five hundred eighty-seven million, two hundred twelve thousand, three hundred sixty-one".