20856552 has 96 divisors (see below), whose sum is σ = 57765120. Its totient is φ = 6266880.

The previous prime is 20856551. The next prime is 20856599. The reversal of 20856552 is 25565802.

It is a super-2 number, since 2×20856552² = 869991522657408, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214968 + ... + 215064.

It is an arithmetic number, because the mean of its divisors is an integer number (601720).

Almost surely, 2^20856552 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 20856552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28882560).

20856552 is an abundant number, since it is smaller than the sum of its proper divisors (36908568).

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

20856552 is a wasteful number, since it uses less digits than its factorization.

20856552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 20856552 is about 4566.8974150948. The cubic root of 20856552 is about 275.2627879203.

The spelling of 20856552 in words is "twenty million, eight hundred fifty-six thousand, five hundred fifty-two".