20648730108025 has 12 divisors (see below), whose sum is σ = 27110568001212. Its totient is φ = 15547279139840.

The previous prime is 20648730108023. The next prime is 20648730108047. The reversal of 20648730108025 is 52080103784602.

It can be written as a sum of positive squares in 6 ways, for example, as 2455664507136 + 18193065600889 = 1567056^2 + 4265333^2 .

It is not a de Polignac number, because 20648730108025 - 2¹ = 20648730108023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648730108023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24292623232 + ... + 24292624081.

It is an arithmetic number, because the mean of its divisors is an integer number (2259214000101).

Almost surely, 2^{20648730108025} is an apocalyptic number.

20648730108025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20648730108025 is a deficient number, since it is larger than the sum of its proper divisors (6461837893187).

20648730108025 is a wasteful number, since it uses less digits than its factorization.

20648730108025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48585247340 (or 48585247335 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20648730108025 in words is "twenty trillion, six hundred forty-eight billion, seven hundred thirty million, one hundred eight thousand, twenty-five".