20407806 has 24 divisors (see below), whose sum is σ = 44402904. Its totient is φ = 6774000.

The previous prime is 20407787. The next prime is 20407813. The reversal of 20407806 is 60870402.

20407806 is nontrivially palindromic in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 20407806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2260 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1850121).

Almost surely, 2^20407806 is an apocalyptic number.

It is a pronic number, being equal to 4517×4518.

20407806 is an abundant number, since it is smaller than the sum of its proper divisors (23995098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20407806 is a wasteful number, since it uses less digits than its factorization.

20407806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20407806 is about 4517.4999723298. The cubic root of 20407806 is about 273.2742885880.

The spelling of 20407806 in words is "twenty million, four hundred seven thousand, eight hundred six".