20877649081 has 27 divisors (see below), whose sum is σ = 22225982373. Its totient is φ = 19610318520.

The previous prime is 20877649043. The next prime is 20877649087. The reversal of 20877649081 is 18094677802.

The square root of 20877649081 is 144491.

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

It is not a de Polignac number, because 20877649081 - 2¹¹ = 20877647033 is a prime.

It is a super-2 number, since 2×20877649081² (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 (20877649087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 264274000 + ... + 264274078.

Almost surely, 2^20877649081 is an apocalyptic number.

20877649081 is the 144491-st square number.

20877649081 is the 72246-th centered octagonal number.

It is an amenable number.

20877649081 is a deficient number, since it is larger than the sum of its proper divisors (1348333292).

20877649081 is an frugal number, since it uses more digits than its factorization.

20877649081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 20877649081 in words is "twenty billion, eight hundred seventy-seven million, six hundred forty-nine thousand, eighty-one".