20786990 has 32 divisors (see below), whose sum is σ = 43070400. Its totient is φ = 7075584.

The previous prime is 20786981. The next prime is 20787001. The reversal of 20786990 is 9968702.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9434 + ... + 11426.

It is an arithmetic number, because the mean of its divisors is an integer number (1345950).

Almost surely, 2^20786990 is an apocalyptic number.

20786990 is an abundant number, since it is smaller than the sum of its proper divisors (22283410).

20786990 is a wasteful number, since it uses less digits than its factorization.

20786990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20786990 is about 4559.2751616896. The cubic root of 20786990 is about 274.9564228471.

The spelling of 20786990 in words is "twenty million, seven hundred eighty-six thousand, nine hundred ninety".