20856418 has 8 divisors (see below), whose sum is σ = 34128720. Its totient is φ = 9480180.

The previous prime is 20856389. The next prime is 20856439. The reversal of 20856418 is 81465802.

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, 473988 + ... + 474031.

It is an arithmetic number, because the mean of its divisors is an integer number (4266090).

Almost surely, 2^20856418 is an apocalyptic number.

20856418 is a deficient number, since it is larger than the sum of its proper divisors (13272302).

20856418 is a wasteful number, since it uses less digits than its factorization.

20856418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948032.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20856418 is about 4566.8827442797. The cubic root of 20856418 is about 275.2621984126.

The spelling of 20856418 in words is "twenty million, eight hundred fifty-six thousand, four hundred eighteen".