20285738 has 8 divisors (see below), whose sum is σ = 33194880. Its totient is φ = 9220780.

The previous prime is 20285737. The next prime is 20285753. The reversal of 20285738 is 83758202.

It is a happy number.

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

It is a super-2 number, since 2×20285738² = 823022332409288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20285698 and 20285707.

It is not an unprimeable number, because it can be changed into a prime (20285737) by changing a digit.

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, 461018 + ... + 461061.

It is an arithmetic number, because the mean of its divisors is an integer number (4149360).

Almost surely, 2^20285738 is an apocalyptic number.

20285738 is a deficient number, since it is larger than the sum of its proper divisors (12909142).

20285738 is a wasteful number, since it uses less digits than its factorization.

20285738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922092.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 20285738 is about 4503.9691384378. The cubic root of 20285738 is about 272.7283409992.

The spelling of 20285738 in words is "twenty million, two hundred eighty-five thousand, seven hundred thirty-eight".