20123125706137 has 4 divisors (see below), whose sum is σ = 20123179467300. Its totient is φ = 20123071944976.

The previous prime is 20123125706129. The next prime is 20123125706183. The reversal of 20123125706137 is 73160752132102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2515836927321 + 17607288778816 = 1586139^2 + 4196104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123125706137 - 2³ = 20123125706129 is a prime.

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 20123125706137.

It is not an unprimeable number, because it can be changed into a prime (20123125706737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26315158 + ... + 27069055.

It is an arithmetic number, because the mean of its divisors is an integer number (5030794866825).

Almost surely, 2^{20123125706137} is an apocalyptic number.

It is an amenable number.

20123125706137 is a deficient number, since it is larger than the sum of its proper divisors (53761163).

20123125706137 is an equidigital number, since it uses as much as digits as its factorization.

20123125706137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53761162.

The product of its (nonzero) digits is 105840, while the sum is 40.

Adding to 20123125706137 its reverse (73160752132102), we get a palindrome (93283877838239).

The spelling of 20123125706137 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-five million, seven hundred six thousand, one hundred thirty-seven".