20138782 has 8 divisors (see below), whose sum is σ = 30230352. Its totient is φ = 10062000.

The previous prime is 20138743. The next prime is 20138801. The reversal of 20138782 is 28783102.

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

It is a congruent number.

It is an unprimeable number.

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, 807 + ... + 6397.

It is an arithmetic number, because the mean of its divisors is an integer number (3778794).

Almost surely, 2^20138782 is an apocalyptic number.

20138782 is a deficient number, since it is larger than the sum of its proper divisors (10091570).

20138782 is a wasteful number, since it uses less digits than its factorization.

20138782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7394.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20138782 is about 4487.6254300019. The cubic root of 20138782 is about 272.0681688281.

It can be divided in two parts, 201 and 38782, that added together give a palindrome (38983).

The spelling of 20138782 in words is "twenty million, one hundred thirty-eight thousand, seven hundred eighty-two".