20885738 has 8 divisors (see below), whose sum is σ = 31757988. Its totient is φ = 10299744.

The previous prime is 20885737. The next prime is 20885747. The reversal of 20885738 is 83758802.

It can be written as a sum of positive squares in 2 ways, for example, as 17833729 + 3052009 = 4223^2 + 1747^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20885695 and 20885704.

It is not an unprimeable number, because it can be changed into a prime (20885737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71381 + ... + 71672.

Almost surely, 2^20885738 is an apocalyptic number.

20885738 is a deficient number, since it is larger than the sum of its proper divisors (10872250).

20885738 is a wasteful number, since it uses less digits than its factorization.

20885738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143128.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 20885738 is about 4570.0916839818. The cubic root of 20885738 is about 275.3911260914.

The spelling of 20885738 in words is "twenty million, eight hundred eighty-five thousand, seven hundred thirty-eight".