20842136 has 32 divisors (see below), whose sum is σ = 47291040. Its totient is φ = 8406528.

The previous prime is 20842127. The next prime is 20842141. The reversal of 20842136 is 63124802.

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 7 ways as a sum of consecutive naturals, for example, 9995 + ... + 11898.

It is an arithmetic number, because the mean of its divisors is an integer number (1477845).

Almost surely, 2^20842136 is an apocalyptic number.

It is an amenable number.

20842136 is an abundant number, since it is smaller than the sum of its proper divisors (26448904).

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

20842136 is a wasteful number, since it uses less digits than its factorization.

20842136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21923 (or 21919 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20842136 is about 4565.3188278586. The cubic root of 20842136 is about 275.1993529708.

Adding to 20842136 its reverse (63124802), we get a palindrome (83966938).

The spelling of 20842136 in words is "twenty million, eight hundred forty-two thousand, one hundred thirty-six".