20793985 has 16 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 16136640.

The previous prime is 20793973. The next prime is 20793989. The reversal of 20793985 is 58939702.

It is a happy number.

It is not a de Polignac number, because 20793985 - 2⁵ = 20793953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20793989) 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 15 ways as a sum of consecutive naturals, for example, 23664 + ... + 24526.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^20793985 is an apocalyptic number.

It is an amenable number.

20793985 is a deficient number, since it is larger than the sum of its proper divisors (4918655).

20793985 is an equidigital number, since it uses as much as digits as its factorization.

20793985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20793985 is about 4560.0422147169. The cubic root of 20793985 is about 274.9872611179.

The spelling of 20793985 in words is "twenty million, seven hundred ninety-three thousand, nine hundred eighty-five".