20565122016 has 24 divisors (see below), whose sum is σ = 53983445544. Its totient is φ = 6855040640.

The previous prime is 20565122009. The next prime is 20565122021. The reversal of 20565122016 is 61022156502.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

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, 107109915 + ... + 107110106.

It is an arithmetic number, because the mean of its divisors is an integer number (2249310231).

Almost surely, 2^20565122016 is an apocalyptic number.

It is an amenable number.

20565122016 is an abundant number, since it is smaller than the sum of its proper divisors (33418323528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20565122016 is a wasteful number, since it uses less digits than its factorization.

20565122016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214220034 (or 214220026 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 20565122016 its reverse (61022156502), we get a palindrome (81587278518).

The spelling of 20565122016 in words is "twenty billion, five hundred sixty-five million, one hundred twenty-two thousand, sixteen".