20105782 has 4 divisors (see below), whose sum is σ = 30158676. Its totient is φ = 10052890.

The previous prime is 20105779. The next prime is 20105791. The reversal of 20105782 is 28750102.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026444 + ... + 5026447.

It is an arithmetic number, because the mean of its divisors is an integer number (7539669).

Almost surely, 2^20105782 is an apocalyptic number.

20105782 is a deficient number, since it is larger than the sum of its proper divisors (10052894).

20105782 is a wasteful number, since it uses less digits than its factorization.

20105782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052893.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 20105782 is about 4483.9471450944. The cubic root of 20105782 is about 271.9194812850.

Adding to 20105782 its reverse (28750102), we get a palindrome (48855884).

The spelling of 20105782 in words is "twenty million, one hundred five thousand, seven hundred eighty-two".