20632656 has 80 divisors (see below), whose sum is σ = 60710400. Its totient is φ = 5976960.

The previous prime is 20632649. The next prime is 20632657. The reversal of 20632656 is 65623602.

It is a super-2 number, since 2×20632656² = 851412987228672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632657) 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 15 ways as a sum of consecutive naturals, for example, 11295 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (758880).

Almost surely, 2^20632656 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 20632656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30355200).

20632656 is an abundant number, since it is smaller than the sum of its proper divisors (40077744).

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

20632656 is a wasteful number, since it uses less digits than its factorization.

20632656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20632656 is about 4542.3183507984. The cubic root of 20632656 is about 274.2742560938.

The spelling of 20632656 in words is "twenty million, six hundred thirty-two thousand, six hundred fifty-six".