20773640 has 32 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 8286144.

The previous prime is 20773637. The next prime is 20773651. The reversal of 20773640 is 4637702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24341 + ... + 25179.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^20773640 is an apocalyptic number.

20773640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20773640 is an abundant number, since it is smaller than the sum of its proper divisors (26098360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20773640 is a wasteful number, since it uses less digits than its factorization.

20773640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 20773640 is about 4557.8108780422. The cubic root of 20773640 is about 274.8975486133.

The spelling of 20773640 in words is "twenty million, seven hundred seventy-three thousand, six hundred forty".