20978086 has 16 divisors (see below), whose sum is σ = 32095008. Its totient is φ = 10281600.

The previous prime is 20978077. The next prime is 20978117. The reversal of 20978086 is 68087902.

It is a plaindrome in base 13.

It is a congruent 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, 33916 + ... + 34528.

It is an arithmetic number, because the mean of its divisors is an integer number (2005938).

Almost surely, 2^20978086 is an apocalyptic number.

20978086 is a deficient number, since it is larger than the sum of its proper divisors (11116922).

20978086 is a wasteful number, since it uses less digits than its factorization.

20978086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 20978086 is about 4580.1840574370. The cubic root of 20978086 is about 275.7964174687.

The spelling of 20978086 in words is "twenty million, nine hundred seventy-eight thousand, eighty-six".