20855456 has 12 divisors (see below), whose sum is σ = 41059242. Its totient is φ = 10427712.

The previous prime is 20855453. The next prime is 20855479. The reversal of 20855456 is 65455802.

It can be written as a sum of positive squares in only one way, i.e., 10995856 + 9859600 = 3316^2 + 3140^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20855453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325835 + ... + 325898.

Almost surely, 2^20855456 is an apocalyptic number.

It is an amenable number.

20855456 is a deficient number, since it is larger than the sum of its proper divisors (20203786).

20855456 is an equidigital number, since it uses as much as digits as its factorization.

20855456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651743 (or 651735 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 20855456 is about 4566.7774195816. Note that the first 3 decimals coincide. The cubic root of 20855456 is about 275.2579662013.

The spelling of 20855456 in words is "twenty million, eight hundred fifty-five thousand, four hundred fifty-six".