20215776 has 96 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 5677056.

The previous prime is 20215757. The next prime is 20215777. The reversal of 20215776 is 67751202.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215777) 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, 44800 + ... + 45248.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^20215776 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 20215776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

20215776 is an abundant number, since it is smaller than the sum of its proper divisors (41473824).

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

20215776 is a wasteful number, since it uses less digits than its factorization.

20215776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 20215776 is about 4496.1957252771. The cubic root of 20215776 is about 272.4144489178.

Adding to 20215776 its reverse (67751202), we get a palindrome (87966978).

The spelling of 20215776 in words is "twenty million, two hundred fifteen thousand, seven hundred seventy-six".