20361656 has 48 divisors (see below), whose sum is σ = 44870400. Its totient is φ = 8636544.

The previous prime is 20361641. The next prime is 20361659. The reversal of 20361656 is 65616302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361659) 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 11 ways as a sum of consecutive naturals, for example, 49580 + ... + 49988.

It is an arithmetic number, because the mean of its divisors is an integer number (934800).

Almost surely, 2^20361656 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 20361656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22435200).

20361656 is an abundant number, since it is smaller than the sum of its proper divisors (24508744).

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

20361656 is a wasteful number, since it uses less digits than its factorization.

20361656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20361656 is about 4512.3891676140. The cubic root of 20361656 is about 273.0681399054.

Adding to 20361656 its reverse (65616302), we get a palindrome (85977958).

The spelling of 20361656 in words is "twenty million, three hundred sixty-one thousand, six hundred fifty-six".