20787406 has 8 divisors (see below), whose sum is σ = 32822280. Its totient is φ = 9846648.

The previous prime is 20787401. The next prime is 20787409. The reversal of 20787406 is 60478702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273481 + ... + 273556.

It is an arithmetic number, because the mean of its divisors is an integer number (4102785).

Almost surely, 2^20787406 is an apocalyptic number.

20787406 is a deficient number, since it is larger than the sum of its proper divisors (12034874).

20787406 is a wasteful number, since it uses less digits than its factorization.

20787406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547058.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20787406 is about 4559.3207827482. The cubic root of 20787406 is about 274.9582570249.

The spelling of 20787406 in words is "twenty million, seven hundred eighty-seven thousand, four hundred six".