20516551028 has 6 divisors (see below), whose sum is σ = 35903964306. Its totient is φ = 10258275512.

The previous prime is 20516551021. The next prime is 20516551067. The reversal of 20516551028 is 82015561502.

It can be written as a sum of positive squares in only one way, i.e., 19697561104 + 818989924 = 140348^2 + 28618^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516551021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564568875 + ... + 2564568882.

It is an arithmetic number, because the mean of its divisors is an integer number (5983994051).

Almost surely, 2^20516551028 is an apocalyptic number.

It is an amenable number.

20516551028 is a deficient number, since it is larger than the sum of its proper divisors (15387413278).

20516551028 is a wasteful number, since it uses less digits than its factorization.

20516551028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129137761 (or 5129137759 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 20516551028 in words is "twenty billion, five hundred sixteen million, five hundred fifty-one thousand, twenty-eight".