20266636 has 12 divisors (see below), whose sum is σ = 38194912. Its totient is φ = 9353808.

The previous prime is 20266633. The next prime is 20266637. The reversal of 20266636 is 63666202.

It is a junction number, because it is equal to n+sod(n) for n = 20266598 and 20266607.

It is not an unprimeable number, because it can be changed into a prime (20266633) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 194820 + ... + 194923.

Almost surely, 2^20266636 is an apocalyptic number.

20266636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20266636 is a deficient number, since it is larger than the sum of its proper divisors (17928276).

20266636 is a wasteful number, since it uses less digits than its factorization.

20266636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389760 (or 389758 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 20266636 is about 4501.8480649618. The cubic root of 20266636 is about 272.6427095267.

It can be divided in two parts, 20266 and 636, that added together give a palindrome (20902).

The spelling of 20266636 in words is "twenty million, two hundred sixty-six thousand, six hundred thirty-six".