20028776 has 8 divisors (see below), whose sum is σ = 37553970. Its totient is φ = 10014384.

The previous prime is 20028773. The next prime is 20028809. The reversal of 20028776 is 67782002.

It can be written as a sum of positive squares in only one way, i.e., 20016676 + 12100 = 4474^2 + 110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20028773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1251791 + ... + 1251806.

Almost surely, 2^20028776 is an apocalyptic number.

It is an amenable number.

20028776 is a deficient number, since it is larger than the sum of its proper divisors (17525194).

20028776 is a wasteful number, since it uses less digits than its factorization.

20028776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503603 (or 2503599 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20028776 is about 4475.3520531909. The cubic root of 20028776 is about 271.5718827423.

The spelling of 20028776 in words is "twenty million, twenty-eight thousand, seven hundred seventy-six".