20540245 has 8 divisors (see below), whose sum is σ = 26889120. Its totient is φ = 14938320.

The previous prime is 20540243. The next prime is 20540249. The reversal of 20540245 is 54204502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20540245 - 2¹ = 20540243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186675 + ... + 186784.

It is an arithmetic number, because the mean of its divisors is an integer number (3361140).

Almost surely, 2^20540245 is an apocalyptic number.

It is an amenable number.

20540245 is a deficient number, since it is larger than the sum of its proper divisors (6348875).

20540245 is a wasteful number, since it uses less digits than its factorization.

20540245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373475.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20540245 is about 4532.1347067359. The cubic root of 20540245 is about 273.8641635824.

Adding to 20540245 its reverse (54204502), we get a palindrome (74744747).

The spelling of 20540245 in words is "twenty million, five hundred forty thousand, two hundred forty-five".