20242836 has 18 divisors (see below), whose sum is σ = 51169482. Its totient is φ = 6747600.

The previous prime is 20242793. The next prime is 20242861. The reversal of 20242836 is 63824202.

20242836 is a `hidden beast` number, since 202 + 428 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 1838736 = 4290^2 + 1356^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 281115 + ... + 281186.

It is an arithmetic number, because the mean of its divisors is an integer number (2842749).

Almost surely, 2^20242836 is an apocalyptic number.

It is an amenable number.

20242836 is an abundant number, since it is smaller than the sum of its proper divisors (30926646).

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

20242836 is a wasteful number, since it uses less digits than its factorization.

20242836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562311 (or 562306 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20242836 is about 4499.2039295858. The cubic root of 20242836 is about 272.5359422893.

The spelling of 20242836 in words is "twenty million, two hundred forty-two thousand, eight hundred thirty-six".