20745867628225 has 12 divisors (see below), whose sum is σ = 25724932342704. Its totient is φ = 16596657661520.

The previous prime is 20745867628207. The next prime is 20745867628231. The reversal of 20745867628225 is 52282676854702.

It is a de Polignac number, because none of the positive numbers 2^k-20745867628225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22023342 + ... + 22946008.

It is an arithmetic number, because the mean of its divisors is an integer number (2143744361892).

Almost surely, 2^{20745867628225} is an apocalyptic number.

20745867628225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20745867628225 is a deficient number, since it is larger than the sum of its proper divisors (4979064714479).

20745867628225 is an equidigital number, since it uses as much as digits as its factorization.

20745867628225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822064 (or 1822059 counting only the distinct ones).

The product of its (nonzero) digits is 180633600, while the sum is 64.

The spelling of 20745867628225 in words is "twenty trillion, seven hundred forty-five billion, eight hundred sixty-seven million, six hundred twenty-eight thousand, two hundred twenty-five".