20786976 has 144 divisors (see below), whose sum is σ = 70670880. Its totient is φ = 5927040.

The previous prime is 20786947. The next prime is 20786981. The reversal of 20786976 is 67968702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42091 + ... + 42581.

It is an arithmetic number, because the mean of its divisors is an integer number (490770).

Almost surely, 2^20786976 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 20786976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35335440).

20786976 is an abundant number, since it is smaller than the sum of its proper divisors (49883904).

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

20786976 is a wasteful number, since it uses less digits than its factorization.

20786976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 20786976 is about 4559.2736263576. The cubic root of 20786976 is about 274.9563611195.

The spelling of 20786976 in words is "twenty million, seven hundred eighty-six thousand, nine hundred seventy-six".