636254020 has 12 divisors (see below), whose sum is σ = 1336133484. Its totient is φ = 254501600.

The previous prime is 636253979. The next prime is 636254023. The reversal of 636254020 is 20452636.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 230553856 + 405700164 = 15184^2 + 20142^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 636254020.

It is not an unprimeable number, because it can be changed into a prime (636254023) 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, 15906331 + ... + 15906370.

It is an arithmetic number, because the mean of its divisors is an integer number (111344457).

Almost surely, 2^636254020 is an apocalyptic number.

It is an amenable number.

636254020 is an abundant number, since it is smaller than the sum of its proper divisors (699879464).

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

636254020 is a wasteful number, since it uses less digits than its factorization.

636254020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31812710 (or 31812708 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 636254020 is about 25224.0761971574. The cubic root of 636254020 is about 860.0892371796.

The spelling of 636254020 in words is "six hundred thirty-six million, two hundred fifty-four thousand, twenty".