20786634 has 48 divisors (see below), whose sum is σ = 49439520. Its totient is φ = 6259680.

The previous prime is 20786611. The next prime is 20786651. The reversal of 20786634 is 43668702.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54657 + ... + 55035.

It is an arithmetic number, because the mean of its divisors is an integer number (1029990).

Almost surely, 2^20786634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20786634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24719760).

20786634 is an abundant number, since it is smaller than the sum of its proper divisors (28652886).

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

20786634 is a wasteful number, since it uses less digits than its factorization.

20786634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 672 counting only the distinct ones).

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

The square root of 20786634 is about 4559.2361202289. The cubic root of 20786634 is about 274.9548531947.

The spelling of 20786634 in words is "twenty million, seven hundred eighty-six thousand, six hundred thirty-four".