20028706 has 8 divisors (see below), whose sum is σ = 30085020. Its totient is φ = 10000368.

The previous prime is 20028691. The next prime is 20028707. The reversal of 20028706 is 60782002.

It can be written as a sum of positive squares in 2 ways, for example, as 16475481 + 3553225 = 4059^2 + 1885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20028706² = 802298128068872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20028707) 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 in 3 ways as a sum of consecutive naturals, for example, 5101 + ... + 8128.

Almost surely, 2^20028706 is an apocalyptic number.

20028706 is a deficient number, since it is larger than the sum of its proper divisors (10056314).

20028706 is a wasteful number, since it uses less digits than its factorization.

20028706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13988.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20028706 is about 4475.3442325703. The cubic root of 20028706 is about 271.5715663632.

The spelling of 20028706 in words is "twenty million, twenty-eight thousand, seven hundred six".