20256705 has 48 divisors (see below), whose sum is σ = 40569984. Its totient is φ = 9158400.

The previous prime is 20256689. The next prime is 20256737. The reversal of 20256705 is 50765202.

It is not a de Polignac number, because 20256705 - 2⁴ = 20256689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33405 + ... + 34005.

It is an arithmetic number, because the mean of its divisors is an integer number (845208).

Almost surely, 2^20256705 is an apocalyptic number.

It is an amenable number.

20256705 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20256705 is a wasteful number, since it uses less digits than its factorization.

20256705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20256705 is about 4500.7449383408. The cubic root of 20256705 is about 272.5981690460.

The spelling of 20256705 in words is "twenty million, two hundred fifty-six thousand, seven hundred five".