20773543 has 4 divisors (see below), whose sum is σ = 23741200. Its totient is φ = 17805888.

The previous prime is 20773469. The next prime is 20773549. The reversal of 20773543 is 34537702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34537702 = 2 ⋅17268851.

It is a cyclic number.

It is not a de Polignac number, because 20773543 - 2¹³ = 20765351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20773549) 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, 1483818 + ... + 1483831.

It is an arithmetic number, because the mean of its divisors is an integer number (5935300).

Almost surely, 2^20773543 is an apocalyptic number.

20773543 is a deficient number, since it is larger than the sum of its proper divisors (2967657).

20773543 is an equidigital number, since it uses as much as digits as its factorization.

20773543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967656.

The product of its (nonzero) digits is 17640, while the sum is 31.

The square root of 20773543 is about 4557.8002369564. The cubic root of 20773543 is about 274.8971207457.

It can be divided in two parts, 20773 and 543, that added together give a square (21316 = 146²).

The spelling of 20773543 in words is "twenty million, seven hundred seventy-three thousand, five hundred forty-three".