20389597 has 4 divisors (see below), whose sum is σ = 20477340. Its totient is φ = 20301856.

The previous prime is 20389591. The next prime is 20389619. The reversal of 20389597 is 79598302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13388281 + 7001316 = 3659^2 + 2646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20389597 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 (20389591) 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, 43522 + ... + 43987.

It is an arithmetic number, because the mean of its divisors is an integer number (5119335).

Almost surely, 2^20389597 is an apocalyptic number.

It is an amenable number.

20389597 is a deficient number, since it is larger than the sum of its proper divisors (87743).

20389597 is an equidigital number, since it uses as much as digits as its factorization.

20389597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87742.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20389597 is about 4515.4841379414. The cubic root of 20389597 is about 273.1929874717.

The spelling of 20389597 in words is "twenty million, three hundred eighty-nine thousand, five hundred ninety-seven".