20976385 has 8 divisors (see below), whose sum is σ = 26652456. Its totient is φ = 15793920.

The previous prime is 20976377. The next prime is 20976407. The reversal of 20976385 is 58367902.

It can be written as a sum of positive squares in 4 ways, for example, as 4297329 + 16679056 = 2073^2 + 4084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20976385 - 2³ = 20976377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123306 + ... + 123475.

It is an arithmetic number, because the mean of its divisors is an integer number (3331557).

Almost surely, 2^20976385 is an apocalyptic number.

It is an amenable number.

20976385 is a deficient number, since it is larger than the sum of its proper divisors (5676071).

20976385 is a wasteful number, since it uses less digits than its factorization.

20976385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246803.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20976385 is about 4579.9983624451. The cubic root of 20976385 is about 275.7889629852.

The spelling of 20976385 in words is "twenty million, nine hundred seventy-six thousand, three hundred eighty-five".