20780934 has 8 divisors (see below), whose sum is σ = 41561880. Its totient is φ = 6926976.

The previous prime is 20780887. The next prime is 20780941. The reversal of 20780934 is 43908702.

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

20780934 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20780895 and 20780904.

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, 1731739 + ... + 1731750.

It is an arithmetic number, because the mean of its divisors is an integer number (5195235).

Almost surely, 2^20780934 is an apocalyptic number.

20780934 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20780934 is a wasteful number, since it uses less digits than its factorization.

20780934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463494.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20780934 is about 4558.6109726538. The cubic root of 20780934 is about 274.9297186790.

The spelling of 20780934 in words is "twenty million, seven hundred eighty thousand, nine hundred thirty-four".