20656733 has 2 divisors, whose sum is σ = 20656734. Its totient is φ = 20656732.

The previous prime is 20656709. The next prime is 20656763. The reversal of 20656733 is 33765602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 5579044 = 3883^2 + 2362^2 .

It is a cyclic number.

It is not a de Polignac number, because 20656733 - 2²² = 16462429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20656733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20656763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328366 + 10328367.

It is an arithmetic number, because the mean of its divisors is an integer number (10328367).

Almost surely, 2^20656733 is an apocalyptic number.

It is an amenable number.

20656733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20656733 is an equidigital number, since it uses as much as digits as its factorization.

20656733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20656733 is about 4544.9678766742. The cubic root of 20656733 is about 274.3809015046.

The spelling of 20656733 in words is "twenty million, six hundred fifty-six thousand, seven hundred thirty-three".