20697097 has 8 divisors (see below), whose sum is σ = 21990600. Its totient is φ = 19442304.

The previous prime is 20697091. The next prime is 20697101. The reversal of 20697097 is 79079602.

It can be written as a sum of positive squares in 4 ways, for example, as 9265936 + 11431161 = 3044^2 + 3381^2 .

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 20697097 - 2⁷ = 20696969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20697091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8572 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (2748825).

Almost surely, 2^20697097 is an apocalyptic number.

It is an amenable number.

20697097 is a deficient number, since it is larger than the sum of its proper divisors (1293503).

20697097 is a wasteful number, since it uses less digits than its factorization.

20697097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19355.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20697097 is about 4549.4062249924. The cubic root of 20697097 is about 274.5595019446.

The spelling of 20697097 in words is "twenty million, six hundred ninety-seven thousand, ninety-seven".