20516263101 has 24 divisors (see below), whose sum is σ = 30372746040. Its totient is φ = 13337164800.

The previous prime is 20516263093. The next prime is 20516263123. The reversal of 20516263101 is 10136261502.

20516263101 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 626 + 31 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 892455876 + 19623807225 = 29874^2 + 140085^2 .

It is not a de Polignac number, because 20516263101 - 2³ = 20516263093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516262101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 777045 + ... + 803013.

It is an arithmetic number, because the mean of its divisors is an integer number (1265531085).

Almost surely, 2^20516263101 is an apocalyptic number.

It is an amenable number.

20516263101 is a deficient number, since it is larger than the sum of its proper divisors (9856482939).

20516263101 is a wasteful number, since it uses less digits than its factorization.

20516263101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28157 (or 28154 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 20516263101 in words is "twenty billion, five hundred sixteen million, two hundred sixty-three thousand, one hundred one".