20775798 has 16 divisors (see below), whose sum is σ = 46168560. Its totient is φ = 6925248.

The previous prime is 20775793. The next prime is 20775809. The reversal of 20775798 is 89757702.

20775798 is a `hidden beast` number, since 2 + 0 + 77 + 579 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192315 + ... + 192422.

It is an arithmetic number, because the mean of its divisors is an integer number (2885535).

Almost surely, 2^20775798 is an apocalyptic number.

20775798 is an abundant number, since it is smaller than the sum of its proper divisors (25392762).

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

20775798 is a wasteful number, since it uses less digits than its factorization.

20775798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384748 (or 384742 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 20775798 is about 4558.0476083516. The cubic root of 20775798 is about 274.9070672207.

It can be divided in two parts, 2077 and 5798, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 20775798 in words is "twenty million, seven hundred seventy-five thousand, seven hundred ninety-eight".