20502145 has 8 divisors (see below), whose sum is σ = 24626880. Its totient is φ = 16385520.

The previous prime is 20502143. The next prime is 20502151. The reversal of 20502145 is 54120502.

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

It is not a de Polignac number, because 20502145 - 2¹ = 20502143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20502143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9036 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (3078360).

Almost surely, 2^20502145 is an apocalyptic number.

It is an amenable number.

20502145 is a deficient number, since it is larger than the sum of its proper divisors (4124735).

20502145 is a wasteful number, since it uses less digits than its factorization.

20502145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20502145 is about 4527.9294384961. The cubic root of 20502145 is about 273.6947290122.

Adding to 20502145 its reverse (54120502), we get a palindrome (74622647).

The spelling of 20502145 in words is "twenty million, five hundred two thousand, one hundred forty-five".