20789380 has 12 divisors (see below), whose sum is σ = 43657740. Its totient is φ = 8315744.

The previous prime is 20789371. The next prime is 20789393. The reversal of 20789380 is 8398702.

It can be written as a sum of positive squares in 2 ways, for example, as 5171076 + 15618304 = 2274^2 + 3952^2 .

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 3 ways as a sum of consecutive naturals, for example, 519715 + ... + 519754.

It is an arithmetic number, because the mean of its divisors is an integer number (3638145).

Almost surely, 2^20789380 is an apocalyptic number.

20789380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20789380 is an abundant number, since it is smaller than the sum of its proper divisors (22868360).

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

20789380 is a wasteful number, since it uses less digits than its factorization.

20789380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039478 (or 1039476 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20789380 is about 4559.5372572225. The cubic root of 20789380 is about 274.9669602179.

The spelling of 20789380 in words is "twenty million, seven hundred eighty-nine thousand, three hundred eighty".