20856741 has 8 divisors (see below), whose sum is σ = 28487424. Its totient is φ = 13565280.

The previous prime is 20856733. The next prime is 20856751. The reversal of 20856741 is 14765802.

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

It is not a de Polignac number, because 20856741 - 2³ = 20856733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856721) 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, 84661 + ... + 84906.

It is an arithmetic number, because the mean of its divisors is an integer number (3560928).

Almost surely, 2^20856741 is an apocalyptic number.

It is an amenable number.

20856741 is a deficient number, since it is larger than the sum of its proper divisors (7630683).

20856741 is a wasteful number, since it uses less digits than its factorization.

20856741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169611.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20856741 is about 4566.9181074331. The cubic root of 20856741 is about 275.2636193858.

The spelling of 20856741 in words is "twenty million, eight hundred fifty-six thousand, seven hundred forty-one".