20305544466125 has 16 divisors (see below), whose sum is σ = 26831985349104. Its totient is φ = 15288880537600.

The previous prime is 20305544466121. The next prime is 20305544466133. The reversal of 20305544466125 is 52166444550302.

It can be written as a sum of positive squares in 8 ways, for example, as 1189927542244 + 19115616923881 = 1090838^2 + 4372141^2 .

It is not a de Polignac number, because 20305544466125 - 2² = 20305544466121 is a prime.

It is a super-2 number, since 2×20305544466125² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20305544466125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305544466121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4777773044 + ... + 4777777293.

It is an arithmetic number, because the mean of its divisors is an integer number (1676999084319).

Almost surely, 2^{20305544466125} is an apocalyptic number.

20305544466125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20305544466125 is a deficient number, since it is larger than the sum of its proper divisors (6526440882979).

20305544466125 is an equidigital number, since it uses as much as digits as its factorization.

20305544466125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9555550369 (or 9555550359 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 47.

The spelling of 20305544466125 in words is "twenty trillion, three hundred five billion, five hundred forty-four million, four hundred sixty-six thousand, one hundred twenty-five".