20778276 has 24 divisors (see below), whose sum is σ = 48835360. Its totient is φ = 6875712.

The previous prime is 20778253. The next prime is 20778283. The reversal of 20778276 is 67287702.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 4561 + ... + 7896.

Almost surely, 2^20778276 is an apocalyptic number.

It is an amenable number.

20778276 is an abundant number, since it is smaller than the sum of its proper divisors (28057084).

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

20778276 is a wasteful number, since it uses less digits than its factorization.

20778276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12603 (or 12601 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 20778276 is about 4558.3194271573. The cubic root of 20778276 is about 274.9179964861.

The spelling of 20778276 in words is "twenty million, seven hundred seventy-eight thousand, two hundred seventy-six".