20696847 has 4 divisors (see below), whose sum is σ = 27595800. Its totient is φ = 13797896.

The previous prime is 20696843. The next prime is 20696857. The reversal of 20696847 is 74869602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20696847 - 2² = 20696843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20696799 and 20696808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20696843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3449472 + ... + 3449477.

It is an arithmetic number, because the mean of its divisors is an integer number (6898950).

Almost surely, 2^20696847 is an apocalyptic number.

20696847 is a deficient number, since it is larger than the sum of its proper divisors (6898953).

20696847 is an equidigital number, since it uses as much as digits as its factorization.

20696847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6898952.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20696847 is about 4549.3787487964. The cubic root of 20696847 is about 274.5583964731.

The spelling of 20696847 in words is "twenty million, six hundred ninety-six thousand, eight hundred forty-seven".