20389521359 has 4 divisors (see below), whose sum is σ = 20886826800. Its totient is φ = 19892215920.

The previous prime is 20389521323. The next prime is 20389521371. The reversal of 20389521359 is 95312598302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20389521359 - 2¹² = 20389517263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389521379) 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, 248652659 + ... + 248652740.

It is an arithmetic number, because the mean of its divisors is an integer number (5221706700).

Almost surely, 2^20389521359 is an apocalyptic number.

20389521359 is a deficient number, since it is larger than the sum of its proper divisors (497305441).

20389521359 is an equidigital number, since it uses as much as digits as its factorization.

20389521359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497305440.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 20389521359 in words is "twenty billion, three hundred eighty-nine million, five hundred twenty-one thousand, three hundred fifty-nine".