20209136 has 10 divisors (see below), whose sum is σ = 39155232. Its totient is φ = 10104560.

The previous prime is 20209121. The next prime is 20209139. The reversal of 20209136 is 63190202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209139) 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 as a sum of consecutive naturals, namely, 631520 + ... + 631551.

Almost surely, 2^20209136 is an apocalyptic number.

It is an amenable number.

20209136 is a deficient number, since it is larger than the sum of its proper divisors (18946096).

20209136 is a wasteful number, since it uses less digits than its factorization.

20209136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263079 (or 1263073 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20209136 is about 4495.4572626152. The cubic root of 20209136 is about 272.3846202332.

Adding to 20209136 its reverse (63190202), we get a palindrome (83399338).

The spelling of 20209136 in words is "twenty million, two hundred nine thousand, one hundred thirty-six".