20528456481 has 16 divisors (see below), whose sum is σ = 32751953920. Its totient is φ = 12632896080.

The previous prime is 20528456477. The next prime is 20528456489. The reversal of 20528456481 is 18465482502.

20528456481 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 8 + 4 + 564 + 81 = 666.

It is not a de Polignac number, because 20528456481 - 2² = 20528456477 is a prime.

It is a super-2 number, since 2×20528456481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20528456489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29242465 + ... + 29243166.

It is an arithmetic number, because the mean of its divisors is an integer number (2046997120).

Almost surely, 2^20528456481 is an apocalyptic number.

It is an amenable number.

20528456481 is a deficient number, since it is larger than the sum of its proper divisors (12223497439).

20528456481 is a wasteful number, since it uses less digits than its factorization.

20528456481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58485653 (or 58485647 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 20528456481 in words is "twenty billion, five hundred twenty-eight million, four hundred fifty-six thousand, four hundred eighty-one".