20465597 has 4 divisors (see below), whose sum is σ = 20603100. Its totient is φ = 20328096.

The previous prime is 20465593. The next prime is 20465609. The reversal of 20465597 is 79556402.

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 3334276 + 17131321 = 1826^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20465597 - 2² = 20465593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20465597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465593) 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, 68528 + ... + 68825.

It is an arithmetic number, because the mean of its divisors is an integer number (5150775).

Almost surely, 2^20465597 is an apocalyptic number.

It is an amenable number.

20465597 is a deficient number, since it is larger than the sum of its proper divisors (137503).

20465597 is a wasteful number, since it uses less digits than its factorization.

20465597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137502.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20465597 is about 4523.8917979987. The cubic root of 20465597 is about 273.5319989699.

The spelling of 20465597 in words is "twenty million, four hundred sixty-five thousand, five hundred ninety-seven".