20637028 has 6 divisors (see below), whose sum is σ = 36114806. Its totient is φ = 10318512.

The previous prime is 20637013. The next prime is 20637047. The reversal of 20637028 is 82073602.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 4460544 = 4022^2 + 2112^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20636987 and 20637005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2579625 + ... + 2579632.

Almost surely, 2^20637028 is an apocalyptic number.

It is an amenable number.

20637028 is a deficient number, since it is larger than the sum of its proper divisors (15477778).

20637028 is a wasteful number, since it uses less digits than its factorization.

20637028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159261 (or 5159259 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20637028 is about 4542.7995773532. The cubic root of 20637028 is about 274.2936273655.

The spelling of 20637028 in words is "twenty million, six hundred thirty-seven thousand, twenty-eight".