20648836 has 12 divisors (see below), whose sum is σ = 38915212. Its totient is φ = 9530208.

The previous prime is 20648827. The next prime is 20648843. The reversal of 20648836 is 63884602.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 17690436 = 1720^2 + 4206^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20648795 and 20648804.

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 in 3 ways as a sum of consecutive naturals, for example, 198495 + ... + 198598.

Almost surely, 2^20648836 is an apocalyptic number.

20648836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20648836 is a deficient number, since it is larger than the sum of its proper divisors (18266376).

20648836 is a wasteful number, since it uses less digits than its factorization.

20648836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397110 (or 397108 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20648836 is about 4544.0990306110. The cubic root of 20648836 is about 274.3459320807.

The spelling of 20648836 in words is "twenty million, six hundred forty-eight thousand, eight hundred thirty-six".