20584881 has 16 divisors (see below), whose sum is σ = 30582720. Its totient is φ = 13684320.

The previous prime is 20584873. The next prime is 20584897. The reversal of 20584881 is 18848502.

It is not a de Polignac number, because 20584881 - 2³ = 20584873 is a prime.

It is a super-2 number, since 2×20584881² = 847474651568322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20580881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11101 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (1911420).

Almost surely, 2^20584881 is an apocalyptic number.

It is an amenable number.

20584881 is a deficient number, since it is larger than the sum of its proper divisors (9997839).

20584881 is a wasteful number, since it uses less digits than its factorization.

20584881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20584881 is about 4537.0564245995. The cubic root of 20584881 is about 274.0623981001.

The spelling of 20584881 in words is "twenty million, five hundred eighty-four thousand, eight hundred eighty-one".