20497365 has 24 divisors (see below), whose sum is σ = 40604928. Its totient is φ = 9370080.

The previous prime is 20497363. The next prime is 20497387. The reversal of 20497365 is 56379402.

20497365 is a `hidden beast` number, since 204 + 97 + 365 = 666.

It is not a de Polignac number, because 20497365 - 2¹ = 20497363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32221 + ... + 32850.

It is an arithmetic number, because the mean of its divisors is an integer number (1691872).

Almost surely, 2^20497365 is an apocalyptic number.

It is an amenable number.

20497365 is a deficient number, since it is larger than the sum of its proper divisors (20107563).

20497365 is a wasteful number, since it uses less digits than its factorization.

20497365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65089 (or 65086 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20497365 is about 4527.4015726463. The cubic root of 20497365 is about 273.6734570511.

The spelling of 20497365 in words is "twenty million, four hundred ninety-seven thousand, three hundred sixty-five".