20773509 has 8 divisors (see below), whose sum is σ = 28220832. Its totient is φ = 13587600.

The previous prime is 20773469. The next prime is 20773549. The reversal of 20773509 is 90537702.

It is an interprime number because it is at equal distance from previous prime (20773469) and next prime (20773549).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20773509 - 2⁸ = 20773253 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20773509.

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 7 ways as a sum of consecutive naturals, for example, 65167 + ... + 65484.

It is an arithmetic number, because the mean of its divisors is an integer number (3527604).

Almost surely, 2^20773509 is an apocalyptic number.

It is an amenable number.

20773509 is a deficient number, since it is larger than the sum of its proper divisors (7447323).

20773509 is a wasteful number, since it uses less digits than its factorization.

20773509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130707.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 20773509 is about 4557.7965070854. The cubic root of 20773509 is about 274.8969707711.

The spelling of 20773509 in words is "twenty million, seven hundred seventy-three thousand, five hundred nine".