20597697 has 6 divisors (see below), whose sum is σ = 29752242. Its totient is φ = 13731792.

The previous prime is 20597669. The next prime is 20597699. The reversal of 20597697 is 79679502.

It can be written as a sum of positive squares in only one way, i.e., 15023376 + 5574321 = 3876^2 + 2361^2 .

It is not a de Polignac number, because 20597697 - 2²⁰ = 19549121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20597699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1144308 + ... + 1144325.

It is an arithmetic number, because the mean of its divisors is an integer number (4958707).

Almost surely, 2^20597697 is an apocalyptic number.

It is an amenable number.

20597697 is a deficient number, since it is larger than the sum of its proper divisors (9154545).

20597697 is a wasteful number, since it uses less digits than its factorization.

20597697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288639 (or 2288636 counting only the distinct ones).

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

The square root of 20597697 is about 4538.4685743101. The cubic root of 20597697 is about 274.1192627316.

The spelling of 20597697 in words is "twenty million, five hundred ninety-seven thousand, six hundred ninety-seven".