20537245 has 4 divisors (see below), whose sum is σ = 24644700. Its totient is φ = 16429792.

The previous prime is 20537243. The next prime is 20537267. The reversal of 20537245 is 54273502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54273502 = 2 ⋅27136751.

It can be written as a sum of positive squares in 2 ways, for example, as 9018009 + 11519236 = 3003^2 + 3394^2 .

It is a cyclic number.

It is not a de Polignac number, because 20537245 - 2¹ = 20537243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20537243) 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, 2053720 + ... + 2053729.

It is an arithmetic number, because the mean of its divisors is an integer number (6161175).

Almost surely, 2^20537245 is an apocalyptic number.

It is an amenable number.

20537245 is a deficient number, since it is larger than the sum of its proper divisors (4107455).

20537245 is an equidigital number, since it uses as much as digits as its factorization.

20537245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107454.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20537245 is about 4531.8037247877. The cubic root of 20537245 is about 273.8508298808.

The spelling of 20537245 in words is "twenty million, five hundred thirty-seven thousand, two hundred forty-five".