20169638 has 4 divisors (see below), whose sum is σ = 30254460. Its totient is φ = 10084818.

The previous prime is 20169637. The next prime is 20169641. The reversal of 20169638 is 83696102.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20169598 and 20169607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169637) 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 as a sum of consecutive naturals, namely, 5042408 + ... + 5042411.

It is an arithmetic number, because the mean of its divisors is an integer number (7563615).

Almost surely, 2^20169638 is an apocalyptic number.

20169638 is a deficient number, since it is larger than the sum of its proper divisors (10084822).

20169638 is a wasteful number, since it uses less digits than its factorization.

20169638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084821.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20169638 is about 4491.0620124866. The cubic root of 20169638 is about 272.2070493155.

The spelling of 20169638 in words is "twenty million, one hundred sixty-nine thousand, six hundred thirty-eight".