20881653381 has 12 divisors (see below), whose sum is σ = 30202560960. Its totient is φ = 13902561000.

The previous prime is 20881653371. The next prime is 20881653451. The reversal of 20881653381 is 18335618802.

20881653381 is a `hidden beast` number, since 20 + 8 + 8 + 16 + 533 + 81 = 666.

It is not a de Polignac number, because 20881653381 - 2⁵ = 20881653349 is a prime.

It is a super-2 number, since 2×20881653381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881653301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1537971 + ... + 1551488.

It is an arithmetic number, because the mean of its divisors is an integer number (2516880080).

Almost surely, 2^20881653381 is an apocalyptic number.

It is an amenable number.

20881653381 is a deficient number, since it is larger than the sum of its proper divisors (9320907579).

20881653381 is a wasteful number, since it uses less digits than its factorization.

20881653381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090216 (or 3090213 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20881653381 in words is "twenty billion, eight hundred eighty-one million, six hundred fifty-three thousand, three hundred eighty-one".