20436786 has 56 divisors (see below), whose sum is σ = 46745424. Its totient is φ = 6697080.

The previous prime is 20436751. The next prime is 20436791. The reversal of 20436786 is 68763402.

It is a self number, because there is not a number n which added to its sum of digits gives 20436786.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 155941 + ... + 156071.

Almost surely, 2^20436786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20436786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23372712).

20436786 is an abundant number, since it is smaller than the sum of its proper divisors (26308638).

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

20436786 is a wasteful number, since it uses less digits than its factorization.

20436786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20436786 is about 4520.7063607361. The cubic root of 20436786 is about 273.4035813231.

The spelling of 20436786 in words is "twenty million, four hundred thirty-six thousand, seven hundred eighty-six".