20361684 has 48 divisors (see below), whose sum is σ = 54591488. Its totient is φ = 5786208.

The previous prime is 20361659. The next prime is 20361689. The reversal of 20361684 is 48616302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361689) 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 15 ways as a sum of consecutive naturals, for example, 18189 + ... + 19275.

Almost surely, 2^20361684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20361684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27295744).

20361684 is an abundant number, since it is smaller than the sum of its proper divisors (34229804).

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

20361684 is a wasteful number, since it uses less digits than its factorization.

20361684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20361684 is about 4512.3922701822. The cubic root of 20361684 is about 273.0682650737.

Adding to 20361684 its reverse (48616302), we get a palindrome (68977986).

The spelling of 20361684 in words is "twenty million, three hundred sixty-one thousand, six hundred eighty-four".