20090836 has 12 divisors (see below), whose sum is σ = 35363412. Its totient is φ = 9987008.

The previous prime is 20090827. The next prime is 20090839. The reversal of 20090836 is 63809002.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 6812100 = 3644^2 + 2610^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13825 + ... + 15208.

It is an arithmetic number, because the mean of its divisors is an integer number (2946951).

Almost surely, 2^20090836 is an apocalyptic number.

It is an amenable number.

20090836 is a deficient number, since it is larger than the sum of its proper divisors (15272576).

20090836 is a wasteful number, since it uses less digits than its factorization.

20090836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29210 (or 29208 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20090836 is about 4482.2802232792. The cubic root of 20090836 is about 271.8520858127.

Adding to 20090836 its reverse (63809002), we get a palindrome (83899838).

The spelling of 20090836 in words is "twenty million, ninety thousand, eight hundred thirty-six".