20777776 has 10 divisors (see below), whose sum is σ = 40256972. Its totient is φ = 10388880.

The previous prime is 20777767. The next prime is 20777777. The reversal of 20777776 is 67777702.

It is not an unprimeable number, because it can be changed into a prime (20777777) 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 as a sum of consecutive naturals, namely, 649290 + ... + 649321.

Almost surely, 2^20777776 is an apocalyptic number.

It is an amenable number.

20777776 is a deficient number, since it is larger than the sum of its proper divisors (19479196).

20777776 is a wasteful number, since it uses less digits than its factorization.

20777776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298619 (or 1298613 counting only the distinct ones).

The product of its (nonzero) digits is 201684, while the sum is 43.

The square root of 20777776 is about 4558.2645820531. The cubic root of 20777776 is about 274.9157912967.

The spelling of 20777776 in words is "twenty million, seven hundred seventy-seven thousand, seven hundred seventy-six".