20777872 has 10 divisors (see below), whose sum is σ = 40257158. Its totient is φ = 10388928.

The previous prime is 20777837. The next prime is 20777899. The reversal of 20777872 is 27877702.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 20736 = 4556^2 + 144^2 .

It is an unprimeable number.

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, 649293 + ... + 649324.

Almost surely, 2^20777872 is an apocalyptic number.

It is an amenable number.

20777872 is a deficient number, since it is larger than the sum of its proper divisors (19479286).

20777872 is a wasteful number, since it uses less digits than its factorization.

20777872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298625 (or 1298619 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 20777872 is about 4558.2751123643. The cubic root of 20777872 is about 274.9162146958.

The spelling of 20777872 in words is "twenty million, seven hundred seventy-seven thousand, eight hundred seventy-two".