20976388 has 12 divisors (see below), whose sum is σ = 37331280. Its totient is φ = 10310312.

The previous prime is 20976377. The next prime is 20976407. The reversal of 20976388 is 88367902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44206 + ... + 44677.

It is an arithmetic number, because the mean of its divisors is an integer number (3110940).

Almost surely, 2^20976388 is an apocalyptic number.

It is an amenable number.

20976388 is a deficient number, since it is larger than the sum of its proper divisors (16354892).

20976388 is a wasteful number, since it uses less digits than its factorization.

20976388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88946 (or 88944 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20976388 is about 4579.9986899561. The cubic root of 20976388 is about 275.7889761328.

The spelling of 20976388 in words is "twenty million, nine hundred seventy-six thousand, three hundred eighty-eight".