20707799825 has 6 divisors (see below), whose sum is σ = 25677671814. Its totient is φ = 16566239840.

The previous prime is 20707799809. The next prime is 20707799837. The reversal of 20707799825 is 52899770702.

It can be written as a sum of positive squares in 3 ways, for example, as 3264522496 + 17443277329 = 57136^2 + 132073^2 .

It is not a de Polignac number, because 20707799825 - 2⁴ = 20707799809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 414155972 + ... + 414156021.

It is an arithmetic number, because the mean of its divisors is an integer number (4279611969).

Almost surely, 2^20707799825 is an apocalyptic number.

20707799825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20707799825 is a deficient number, since it is larger than the sum of its proper divisors (4969871989).

20707799825 is an equidigital number, since it uses as much as digits as its factorization.

20707799825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828312003 (or 828311998 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 20707799825 in words is "twenty billion, seven hundred seven million, seven hundred ninety-nine thousand, eight hundred twenty-five".