20806697 has 8 divisors (see below), whose sum is σ = 21845376. Its totient is φ = 19779232.

The previous prime is 20806693. The next prime is 20806699. The reversal of 20806697 is 79660802.

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 20806697 - 2² = 20806693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20806697.

It is not an unprimeable number, because it can be changed into a prime (20806693) 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, 1133 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (2730672).

Almost surely, 2^20806697 is an apocalyptic number.

It is an amenable number.

20806697 is a deficient number, since it is larger than the sum of its proper divisors (1038679).

20806697 is a wasteful number, since it uses less digits than its factorization.

20806697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20806697 is about 4561.4358485021. The cubic root of 20806697 is about 275.0432857483.

The spelling of 20806697 in words is "twenty million, eight hundred six thousand, six hundred ninety-seven".