20143597 has 4 divisors (see below), whose sum is σ = 20302336. Its totient is φ = 19984860.

The previous prime is 20143567. The next prime is 20143619. The reversal of 20143597 is 79534102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79534102 = 2 ⋅39767051.

It is a cyclic number.

It is not a de Polignac number, because 20143597 - 2²³ = 11754989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143517) 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, 79179 + ... + 79432.

It is an arithmetic number, because the mean of its divisors is an integer number (5075584).

Almost surely, 2^20143597 is an apocalyptic number.

It is an amenable number.

20143597 is a deficient number, since it is larger than the sum of its proper divisors (158739).

20143597 is a wasteful number, since it uses less digits than its factorization.

20143597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158738.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20143597 is about 4488.1618731949. The cubic root of 20143597 is about 272.0898501103.

Adding to 20143597 its reverse (79534102), we get a palindrome (99677699).

The spelling of 20143597 in words is "twenty million, one hundred forty-three thousand, five hundred ninety-seven".