20516263128 has 48 divisors (see below), whose sum is σ = 55769968800. Its totient is φ = 6813512640.

The previous prime is 20516263123. The next prime is 20516263129. The reversal of 20516263128 is 82136261502.

20516263128 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 626 + 3 + 1 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20516263092 and 20516263101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516263123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506223 + ... + 545246.

It is an arithmetic number, because the mean of its divisors is an integer number (1161874350).

Almost surely, 2^20516263128 is an apocalyptic number.

It is an amenable number.

20516263128 is an abundant number, since it is smaller than the sum of its proper divisors (35253705672).

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

20516263128 is a wasteful number, since it uses less digits than its factorization.

20516263128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051752 (or 1051745 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20516263128 in words is "twenty billion, five hundred sixteen million, two hundred sixty-three thousand, one hundred twenty-eight".