20856707 has 8 divisors (see below), whose sum is σ = 21659520. Its totient is φ = 20062080.

The previous prime is 20856679. The next prime is 20856709. The reversal of 20856707 is 70765802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20856707 - 2²² = 16662403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20856709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3419 + ... + 7307.

It is an arithmetic number, because the mean of its divisors is an integer number (2707440).

Almost surely, 2^20856707 is an apocalyptic number.

20856707 is a deficient number, since it is larger than the sum of its proper divisors (802813).

20856707 is a wasteful number, since it uses less digits than its factorization.

20856707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20856707 is about 4566.9143850088. The cubic root of 20856707 is about 275.2634698104.

The spelling of 20856707 in words is "twenty million, eight hundred fifty-six thousand, seven hundred seven".