20777996 has 6 divisors (see below), whose sum is σ = 36361500. Its totient is φ = 10388996.

The previous prime is 20777989. The next prime is 20778011. The reversal of 20777996 is 69977702.

It is a self number, because there is not a number n which added to its sum of digits gives 20777996.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2597246 + ... + 2597253.

It is an arithmetic number, because the mean of its divisors is an integer number (6060250).

Almost surely, 2^20777996 is an apocalyptic number.

It is an amenable number.

20777996 is a deficient number, since it is larger than the sum of its proper divisors (15583504).

20777996 is a wasteful number, since it uses less digits than its factorization.

20777996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194503 (or 5194501 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 20777996 is about 4558.2887139803. The cubic root of 20777996 is about 274.9167615844.

The spelling of 20777996 in words is "twenty million, seven hundred seventy-seven thousand, nine hundred ninety-six".