20787273 has 40 divisors (see below), whose sum is σ = 35235200. Its totient is φ = 12107232.

The previous prime is 20787259. The next prime is 20787313. The reversal of 20787273 is 37278702.

It is not a de Polignac number, because 20787273 - 2⁹ = 20786761 is a prime.

It is a super-2 number, since 2×20787273² = 864221437553058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20787203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19488 + ... + 20526.

It is an arithmetic number, because the mean of its divisors is an integer number (880880).

Almost surely, 2^20787273 is an apocalyptic number.

It is an amenable number.

20787273 is a deficient number, since it is larger than the sum of its proper divisors (14447927).

20787273 is a wasteful number, since it uses less digits than its factorization.

20787273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 20787273 is about 4559.3061972190. The cubic root of 20787273 is about 274.9576706198.

The spelling of 20787273 in words is "twenty million, seven hundred eighty-seven thousand, two hundred seventy-three".