20502506 has 8 divisors (see below), whose sum is σ = 30791460. Its totient is φ = 10238688.

The previous prime is 20502491. The next prime is 20502509. The reversal of 20502506 is 60520502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15171025 + 5331481 = 3895^2 + 2309^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20502509) 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, 4091 + ... + 7598.

Almost surely, 2^20502506 is an apocalyptic number.

20502506 is a deficient number, since it is larger than the sum of its proper divisors (10288954).

20502506 is a wasteful number, since it uses less digits than its factorization.

20502506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12568.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20502506 is about 4527.9693020161. The cubic root of 20502506 is about 273.6963354005.

The spelling of 20502506 in words is "twenty million, five hundred two thousand, five hundred six".