20438782 has 48 divisors (see below), whose sum is σ = 39184992. Its totient is φ = 7922880.

The previous prime is 20438779. The next prime is 20438783. The reversal of 20438782 is 28783402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77583 + ... + 77845.

It is an arithmetic number, because the mean of its divisors is an integer number (816354).

Almost surely, 2^20438782 is an apocalyptic number.

20438782 is a deficient number, since it is larger than the sum of its proper divisors (18746210).

20438782 is a wasteful number, since it uses less digits than its factorization.

20438782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 20438782 is about 4520.9271173068. The cubic root of 20438782 is about 273.4124818710.

The spelling of 20438782 in words is "twenty million, four hundred thirty-eight thousand, seven hundred eighty-two".