20644896 has 24 divisors (see below), whose sum is σ = 54193104. Its totient is φ = 6881600.

The previous prime is 20644889. The next prime is 20644903. The reversal of 20644896 is 69844602.

It is an interprime number because it is at equal distance from previous prime (20644889) and next prime (20644903).

It is a tau number, because it is divible by the number of its divisors (24).

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, 107430 + ... + 107621.

It is an arithmetic number, because the mean of its divisors is an integer number (2258046).

Almost surely, 2^20644896 is an apocalyptic number.

It is an amenable number.

20644896 is an abundant number, since it is smaller than the sum of its proper divisors (33548208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20644896 is a wasteful number, since it uses less digits than its factorization.

20644896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215064 (or 215056 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20644896 is about 4543.6654806445. The cubic root of 20644896 is about 274.3284816745.

The spelling of 20644896 in words is "twenty million, six hundred forty-four thousand, eight hundred ninety-six".