20815865522 has 8 divisors (see below), whose sum is σ = 31261832172. Its totient is φ = 10395254800.

The previous prime is 20815865519. The next prime is 20815865537. The reversal of 20815865522 is 22556851802.

20815865522 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19872822841 + 943042681 = 140971^2 + 30709^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6336929 + ... + 6340212.

Almost surely, 2^20815865522 is an apocalyptic number.

20815865522 is a deficient number, since it is larger than the sum of its proper divisors (10445966650).

20815865522 is a wasteful number, since it uses less digits than its factorization.

20815865522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12677964.

The product of its (nonzero) digits is 384000, while the sum is 44.

The spelling of 20815865522 in words is "twenty billion, eight hundred fifteen million, eight hundred sixty-five thousand, five hundred twenty-two".