20778342 has 32 divisors (see below), whose sum is σ = 44927232. Its totient is φ = 6368544.

The previous prime is 20778323. The next prime is 20778353. The reversal of 20778342 is 24387702.

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 15 ways as a sum of consecutive naturals, for example, 37713 + ... + 38259.

It is an arithmetic number, because the mean of its divisors is an integer number (1403976).

Almost surely, 2^20778342 is an apocalyptic number.

20778342 is an abundant number, since it is smaller than the sum of its proper divisors (24148890).

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

20778342 is a wasteful number, since it uses less digits than its factorization.

20778342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20778342 is about 4558.3266666618. The cubic root of 20778342 is about 274.9182875684.

The spelling of 20778342 in words is "twenty million, seven hundred seventy-eight thousand, three hundred forty-two".