20976638 has 8 divisors (see below), whose sum is σ = 31789632. Its totient is φ = 10380096.

The previous prime is 20976611. The next prime is 20976649. The reversal of 20976638 is 83667902.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20976595 and 20976604.

It is a congruent number.

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, 53870 + ... + 54257.

It is an arithmetic number, because the mean of its divisors is an integer number (3973704).

Almost surely, 2^20976638 is an apocalyptic number.

20976638 is a deficient number, since it is larger than the sum of its proper divisors (10812994).

20976638 is a wasteful number, since it uses less digits than its factorization.

20976638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108226.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20976638 is about 4580.0259824591. The cubic root of 20976638 is about 275.7900717610.

The spelling of 20976638 in words is "twenty million, nine hundred seventy-six thousand, six hundred thirty-eight".