20905568 has 24 divisors (see below), whose sum is σ = 42117768. Its totient is φ = 10209024.

The previous prime is 20905559. The next prime is 20905579. The reversal of 20905568 is 86550902.

It is a congruent number.

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, 6221 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (1754907).

Almost surely, 2^20905568 is an apocalyptic number.

It is an amenable number.

20905568 is an abundant number, since it is smaller than the sum of its proper divisors (21212200).

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

20905568 is a wasteful number, since it uses less digits than its factorization.

20905568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15246 (or 15238 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20905568 is about 4572.2607099771. The cubic root of 20905568 is about 275.4782553822.

The spelling of 20905568 in words is "twenty million, nine hundred five thousand, five hundred sixty-eight".