20881418 has 8 divisors (see below), whose sum is σ = 32970720. Its totient is φ = 9891180.

The previous prime is 20881381. The next prime is 20881433. The reversal of 20881418 is 81418802.

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

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, 274718 + ... + 274793.

It is an arithmetic number, because the mean of its divisors is an integer number (4121340).

Almost surely, 2^20881418 is an apocalyptic number.

20881418 is a deficient number, since it is larger than the sum of its proper divisors (12089302).

20881418 is a wasteful number, since it uses less digits than its factorization.

20881418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549532.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 20881418 is about 4569.6190213190. The cubic root of 20881418 is about 275.3721375085.

The spelling of 20881418 in words is "twenty million, eight hundred eighty-one thousand, four hundred eighteen".