20806735 has 16 divisors (see below), whose sum is σ = 25926912. Its totient is φ = 16012800.

The previous prime is 20806733. The next prime is 20806741. The reversal of 20806735 is 53760802.

It is not a de Polignac number, because 20806735 - 2¹ = 20806733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 20806697 and 20806706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37077 + ... + 37633.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^20806735 is an apocalyptic number.

20806735 is a deficient number, since it is larger than the sum of its proper divisors (5120177).

20806735 is a wasteful number, since it uses less digits than its factorization.

20806735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20806735 is about 4561.4400138553. The cubic root of 20806735 is about 275.0434531886.

The spelling of 20806735 in words is "twenty million, eight hundred six thousand, seven hundred thirty-five".