20778270 has 32 divisors (see below), whose sum is σ = 49991040. Its totient is φ = 5527200.

The previous prime is 20778253. The next prime is 20778283. The reversal of 20778270 is 7287702.

It is a happy number.

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, 19245 + ... + 20295.

It is an arithmetic number, because the mean of its divisors is an integer number (1562220).

Almost surely, 2^20778270 is an apocalyptic number.

20778270 is an abundant number, since it is smaller than the sum of its proper divisors (29212770).

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

20778270 is a wasteful number, since it uses less digits than its factorization.

20778270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20778270 is about 4558.3187690200. The cubic root of 20778270 is about 274.9179700240.

The spelling of 20778270 in words is "twenty million, seven hundred seventy-eight thousand, two hundred seventy".