20697597 has 6 divisors (see below), whose sum is σ = 29896542. Its totient is φ = 13798392.

The previous prime is 20697581. The next prime is 20697601. The reversal of 20697597 is 79579602.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 4968441 = 3966^2 + 2229^2 .

It is not a de Polignac number, because 20697597 - 2⁴ = 20697581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1149858 + ... + 1149875.

It is an arithmetic number, because the mean of its divisors is an integer number (4982757).

Almost surely, 2^20697597 is an apocalyptic number.

It is an amenable number.

20697597 is a deficient number, since it is larger than the sum of its proper divisors (9198945).

20697597 is a wasteful number, since it uses less digits than its factorization.

20697597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299739 (or 2299736 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 20697597 is about 4549.4611768868. The cubic root of 20697597 is about 274.5617128609.

The spelling of 20697597 in words is "twenty million, six hundred ninety-seven thousand, five hundred ninety-seven".