20881538 has 8 divisors (see below), whose sum is σ = 32332800. Its totient is φ = 10103940.

The previous prime is 20881529. The next prime is 20881561. The reversal of 20881538 is 83518802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20881498 and 20881507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168338 + ... + 168461.

It is an arithmetic number, because the mean of its divisors is an integer number (4041600).

Almost surely, 2^20881538 is an apocalyptic number.

20881538 is a deficient number, since it is larger than the sum of its proper divisors (11451262).

20881538 is a wasteful number, since it uses less digits than its factorization.

20881538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336832.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 20881538 is about 4569.6321514975. The cubic root of 20881538 is about 275.3726650045.

The spelling of 20881538 in words is "twenty million, eight hundred eighty-one thousand, five hundred thirty-eight".