20978006 has 8 divisors (see below), whose sum is σ = 35962320. Its totient is φ = 8990568.

The previous prime is 20977967. The next prime is 20978011. The reversal of 20978006 is 60087902.

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

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, 749201 + ... + 749228.

It is an arithmetic number, because the mean of its divisors is an integer number (4495290).

Almost surely, 2^20978006 is an apocalyptic number.

20978006 is a deficient number, since it is larger than the sum of its proper divisors (14984314).

20978006 is a wasteful number, since it uses less digits than its factorization.

20978006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498438.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20978006 is about 4580.1753241552. The cubic root of 20978006 is about 275.7960668847.

The spelling of 20978006 in words is "twenty million, nine hundred seventy-eight thousand, six".