18920775 has 12 divisors (see below), whose sum is σ = 31282472. Its totient is φ = 10091040.

The previous prime is 18920773. The next prime is 18920807. The reversal of 18920775 is 57702981.

It is not a de Polignac number, because 18920775 - 2¹ = 18920773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18920773) 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 11 ways as a sum of consecutive naturals, for example, 126064 + ... + 126213.

Almost surely, 2^18920775 is an apocalyptic number.

18920775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18920775 is a deficient number, since it is larger than the sum of its proper divisors (12361697).

18920775 is a wasteful number, since it uses less digits than its factorization.

18920775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252290 (or 252285 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 18920775 is about 4349.8017196190. The cubic root of 18920775 is about 266.4687637558.

The spelling of 18920775 in words is "eighteen million, nine hundred twenty thousand, seven hundred seventy-five".