20597641 has 4 divisors (see below), whose sum is σ = 21154372. Its totient is φ = 20040912.

The previous prime is 20597639. The next prime is 20597651. The reversal of 20597641 is 14679502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14679502 = 2 ⋅7339751.

It can be written as a sum of positive squares in 2 ways, for example, as 7311616 + 13286025 = 2704^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 20597641 - 2¹ = 20597639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20597597 and 20597606.

It is not an unprimeable number, because it can be changed into a prime (20597651) 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, 278310 + ... + 278383.

It is an arithmetic number, because the mean of its divisors is an integer number (5288593).

Almost surely, 2^20597641 is an apocalyptic number.

It is an amenable number.

20597641 is a deficient number, since it is larger than the sum of its proper divisors (556731).

20597641 is an equidigital number, since it uses as much as digits as its factorization.

20597641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556730.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20597641 is about 4538.4624048239. The cubic root of 20597641 is about 274.1190143107.

The spelling of 20597641 in words is "twenty million, five hundred ninety-seven thousand, six hundred forty-one".