20697047 has 8 divisors (see below), whose sum is σ = 23681952. Its totient is φ = 17719200.

The previous prime is 20697043. The next prime is 20697049. The reversal of 20697047 is 74079602.

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 20697047 - 2² = 20697043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20696998 and 20697016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697043) 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, 8597 + ... + 10737.

It is an arithmetic number, because the mean of its divisors is an integer number (2960244).

Almost surely, 2^20697047 is an apocalyptic number.

20697047 is a deficient number, since it is larger than the sum of its proper divisors (2984905).

20697047 is a wasteful number, since it uses less digits than its factorization.

20697047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20697047 is about 4549.4007297665. The cubic root of 20697047 is about 274.5592808510.

The spelling of 20697047 in words is "twenty million, six hundred ninety-seven thousand, forty-seven".