20780288 has 18 divisors (see below), whose sum is σ = 41479914. Its totient is φ = 10390016.

The previous prime is 20780257. The next prime is 20780303. The reversal of 20780288 is 88208702.

It can be written as a sum of positive squares in only one way, i.e., 15618304 + 5161984 = 3952^2 + 2272^2 .

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, 40331 + ... + 40842.

Almost surely, 2^20780288 is an apocalyptic number.

It is an amenable number.

20780288 is a deficient number, since it is larger than the sum of its proper divisors (20699626).

20780288 is an frugal number, since it uses more digits than its factorization.

20780288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81189 (or 81175 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 20780288 is about 4558.5401171866. The cubic root of 20780288 is about 274.9268698106.

The spelling of 20780288 in words is "twenty million, seven hundred eighty thousand, two hundred eighty-eight".