20778760 has 32 divisors (see below), whose sum is σ = 49503960. Its totient is φ = 7822336.

The previous prime is 20778757. The next prime is 20778763. The reversal of 20778760 is 6787702.

It is an interprime number because it is at equal distance from previous prime (20778757) and next prime (20778763).

It can be written as a sum of positive squares in 4 ways, for example, as 14638276 + 6140484 = 3826^2 + 2478^2 .

It is not an unprimeable number, because it can be changed into a prime (20778763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14599 + ... + 15958.

Almost surely, 2^20778760 is an apocalyptic number.

20778760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20778760 is an abundant number, since it is smaller than the sum of its proper divisors (28725200).

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

20778760 is a wasteful number, since it uses less digits than its factorization.

20778760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30585 (or 30581 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 20778760 is about 4558.3725165897. The cubic root of 20778760 is about 274.9201310757.

The spelling of 20778760 in words is "twenty million, seven hundred seventy-eight thousand, seven hundred sixty".