20351636 has 12 divisors (see below), whose sum is σ = 35888160. Its totient is φ = 10097880.

The previous prime is 20351633. The next prime is 20351647. The reversal of 20351636 is 63615302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18896 + ... + 19943.

It is an arithmetic number, because the mean of its divisors is an integer number (2990680).

Almost surely, 2^20351636 is an apocalyptic number.

It is an amenable number.

20351636 is a deficient number, since it is larger than the sum of its proper divisors (15536524).

20351636 is a wasteful number, since it uses less digits than its factorization.

20351636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38974 (or 38972 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20351636 is about 4511.2787544110. The cubic root of 20351636 is about 273.0233401487.

Adding to 20351636 its reverse (63615302), we get a palindrome (83966938).

The spelling of 20351636 in words is "twenty million, three hundred fifty-one thousand, six hundred thirty-six".