20385520521 has 8 divisors (see below), whose sum is σ = 27626279424. Its totient is φ = 13367554320.

The previous prime is 20385520501. The next prime is 20385520543. The reversal of 20385520521 is 12502558302.

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

It is not a de Polignac number, because 20385520521 - 2⁶ = 20385520457 is a prime.

It is a super-2 number, since 2×20385520521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20385520501) 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, 55697961 + ... + 55698326.

It is an arithmetic number, because the mean of its divisors is an integer number (3453284928).

Almost surely, 2^20385520521 is an apocalyptic number.

It is an amenable number.

20385520521 is a deficient number, since it is larger than the sum of its proper divisors (7240758903).

20385520521 is a wasteful number, since it uses less digits than its factorization.

20385520521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111396351.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 20385520521 in words is "twenty billion, three hundred eighty-five million, five hundred twenty thousand, five hundred twenty-one".