20877071121 has 9 divisors (see below), whose sum is σ = 30156395529. Its totient is φ = 13917758436.

The previous prime is 20877071113. The next prime is 20877071147. The reversal of 20877071121 is 12117077802.

The square root of 20877071121 is 144489.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20877071121 - 2³ = 20877071113 is a prime.

It is a super-3 number, since 3×20877071121³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20877071101) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 409386 + ... + 457548.

Almost surely, 2^20877071121 is an apocalyptic number.

20877071121 is the 144489-th square number.

20877071121 is the 72245-th centered octagonal number.

It is an amenable number.

20877071121 is a deficient number, since it is larger than the sum of its proper divisors (9279324408).

20877071121 is an frugal number, since it uses more digits than its factorization.

20877071121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96332 (or 48166 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 36.

Multiplying 20877071121 by its sum of digits (36), we get a square (751574560356 = 866934²).

The spelling of 20877071121 in words is "twenty billion, eight hundred seventy-seven million, seventy-one thousand, one hundred twenty-one".