20677636 has 12 divisors (see below), whose sum is σ = 41355328. Its totient is φ = 8861832.

The previous prime is 20677619. The next prime is 20677639. The reversal of 20677636 is 63677602.

It is a happy number.

20677636 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20677595 and 20677604.

It is not an unprimeable number, because it can be changed into a prime (20677639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369216 + ... + 369271.

Almost surely, 2^20677636 is an apocalyptic number.

It is an amenable number.

20677636 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.

20677636 is a wasteful number, since it uses less digits than its factorization.

20677636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738498 (or 738496 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 20677636 is about 4547.2668714295. The cubic root of 20677636 is about 274.4734209830.

The spelling of 20677636 in words is "twenty million, six hundred seventy-seven thousand, six hundred thirty-six".