636020 has 72 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 194880.

The previous prime is 636017. The next prime is 636023. The reversal of 636020 is 20636.

636020 = T₁₃₆ + T₁₃₇ + ... + T₁₈₄.

636020 is nontrivially palindromic in base 6.

636020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (636017) and next prime (636023).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 636020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10751 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2⁶³⁶⁰²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861840).

636020 is an abundant number, since it is smaller than the sum of its proper divisors (1087660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636020 is a wasteful number, since it uses less digits than its factorization.

636020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 636020 is about 797.5086206431. The cubic root of 636020 is about 85.9983774707.

Adding to 636020 its reverse (20636), we get a palindrome (656656).

The spelling of 636020 in words is "six hundred thirty-six thousand, twenty".