20766543 has 12 divisors (see below), whose sum is σ = 32209560. Its totient is φ = 11866512.

The previous prime is 20766533. The next prime is 20766593. The reversal of 20766543 is 34566702.

It is not a de Polignac number, because 20766543 - 2⁶ = 20766479 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70488 + ... + 70781.

It is an arithmetic number, because the mean of its divisors is an integer number (2684130).

Almost surely, 2^20766543 is an apocalyptic number.

20766543 is a deficient number, since it is larger than the sum of its proper divisors (11443017).

20766543 is a wasteful number, since it uses less digits than its factorization.

20766543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141286 (or 141279 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 20766543 is about 4557.0322579503. The cubic root of 20766543 is about 274.8662401840.

The spelling of 20766543 in words is "twenty million, seven hundred sixty-six thousand, five hundred forty-three".