20882851081 has 27 divisors (see below), whose sum is σ = 22411585287. Its totient is φ = 19456691760.

The previous prime is 20882851079. The next prime is 20882851159. The reversal of 20882851081 is 18015828802.

It is a happy number.

The square root of 20882851081 is 144509.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 679071481 + 20203779600 = 26059^2 + 142140^2 .

It is not a de Polignac number, because 20882851081 - 2¹ = 20882851079 is a prime.

It is a super-2 number, since 2×20882851081² (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 (20882851181) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 202746076 + ... + 202746178.

Almost surely, 2^20882851081 is an apocalyptic number.

20882851081 is the 144509-th square number.

20882851081 is the 72255-th centered octagonal number.

It is an amenable number.

20882851081 is a deficient number, since it is larger than the sum of its proper divisors (1528734206).

20882851081 is an frugal number, since it uses more digits than its factorization.

20882851081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 43.

The spelling of 20882851081 in words is "twenty billion, eight hundred eighty-two million, eight hundred fifty-one thousand, eighty-one".