20459245 has 16 divisors (see below), whose sum is σ = 26112240. Its totient is φ = 15335424.

The previous prime is 20459227. The next prime is 20459249. The reversal of 20459245 is 54295402.

It can be written as a sum of positive squares in 8 ways, for example, as 2157961 + 18301284 = 1469^2 + 4278^2 .

It is a 9-Lehmer number, since φ(20459245) divides (20459245-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 20459245 - 2²¹ = 18362093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20459249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26221 + ... + 26989.

It is an arithmetic number, because the mean of its divisors is an integer number (1632015).

Almost surely, 2^20459245 is an apocalyptic number.

It is an amenable number.

20459245 is a deficient number, since it is larger than the sum of its proper divisors (5652995).

20459245 is a wasteful number, since it uses less digits than its factorization.

20459245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20459245 is about 4523.1896931259. The cubic root of 20459245 is about 273.5036969199.

The spelling of 20459245 in words is "twenty million, four hundred fifty-nine thousand, two hundred forty-five".