20740636 has 12 divisors (see below), whose sum is σ = 41481328. Its totient is φ = 8888832.

The previous prime is 20740633. The next prime is 20740673. The reversal of 20740636 is 63604702.

20740636 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 740737 = 20740636 / (2 + 0 + 7 + 4 + 0 + 6 + 3 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740631) 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, 370341 + ... + 370396.

Almost surely, 2^20740636 is an apocalyptic number.

It is an amenable number.

20740636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20740636 is a wasteful number, since it uses less digits than its factorization.

20740636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740748 (or 740746 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 20740636 is about 4554.1888410561. The cubic root of 20740636 is about 274.7518908200.

The spelling of 20740636 in words is "twenty million, seven hundred forty thousand, six hundred thirty-six".