20266084881 has 27 divisors (see below), whose sum is σ = 34057561161. Its totient is φ = 11578911624.

The previous prime is 20266084849. The next prime is 20266084903. The reversal of 20266084881 is 18848066202.

The square root of 20266084881 is 142359.

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

It is not a de Polignac number, because 20266084881 - 2⁵ = 20266084849 is a prime.

It is a super-2 number, since 2×20266084881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20266084831) 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, 2986150 + ... + 2992928.

Almost surely, 2^20266084881 is an apocalyptic number.

20266084881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20266084881 is the 142359-th square number.

20266084881 is the 71180-th centered octagonal number.

It is an amenable number.

20266084881 is a deficient number, since it is larger than the sum of its proper divisors (13791476280).

20266084881 is an frugal number, since it uses more digits than its factorization.

20266084881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13578 (or 6789 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 20266084881 in words is "twenty billion, two hundred sixty-six million, eighty-four thousand, eight hundred eighty-one".