20778132 has 12 divisors (see below), whose sum is σ = 48482336. Its totient is φ = 6926040.

The previous prime is 20778113. The next prime is 20778139. The reversal of 20778132 is 23187702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20778132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778139) 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 3 ways as a sum of consecutive naturals, for example, 865744 + ... + 865767.

Almost surely, 2^20778132 is an apocalyptic number.

It is an amenable number.

20778132 is an abundant number, since it is smaller than the sum of its proper divisors (27704204).

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

20778132 is a wasteful number, since it uses less digits than its factorization.

20778132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731518 (or 1731516 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20778132 is about 4558.3036318350. The cubic root of 20778132 is about 274.9173613952.

It can be divided in two parts, 20778 and 132, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20778132 in words is "twenty million, seven hundred seventy-eight thousand, one hundred thirty-two".