20775776 has 48 divisors (see below), whose sum is σ = 47156256. Its totient is φ = 8825856.

The previous prime is 20775767. The next prime is 20775779. The reversal of 20775776 is 67757702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30350 + ... + 31026.

It is an arithmetic number, because the mean of its divisors is an integer number (982422).

Almost surely, 2^20775776 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 20775776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23578128).

20775776 is an abundant number, since it is smaller than the sum of its proper divisors (26380480).

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

20775776 is a wasteful number, since it uses less digits than its factorization.

20775776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 20775776 is about 4558.0451950370. The cubic root of 20775776 is about 274.9069701854.

The spelling of 20775776 in words is "twenty million, seven hundred seventy-five thousand, seven hundred seventy-six".