20870976 has 112 divisors (see below), whose sum is σ = 64520064. Its totient is φ = 5830656.

The previous prime is 20870939. The next prime is 20871001. The reversal of 20870976 is 67907802.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

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, 71086 + ... + 71378.

It is an arithmetic number, because the mean of its divisors is an integer number (576072).

Almost surely, 2^20870976 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 20870976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32260032).

20870976 is an abundant number, since it is smaller than the sum of its proper divisors (43649088).

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

20870976 is a wasteful number, since it uses less digits than its factorization.

20870976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20870976 is about 4568.4763324329. The cubic root of 20870976 is about 275.3262288240.

The spelling of 20870976 in words is "twenty million, eight hundred seventy thousand, nine hundred seventy-six".