20120306775257 has 4 divisors (see below), whose sum is σ = 21668022681060. Its totient is φ = 18572590869456.

The previous prime is 20120306775241. The next prime is 20120306775269. The reversal of 20120306775257 is 75257760302102.

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 5414761457296 + 14705545317961 = 2326964^2 + 3834781^2 .

It is not a de Polignac number, because 20120306775257 - 2⁴ = 20120306775241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120306772257) 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, 773857952882 + ... + 773857952907.

It is an arithmetic number, because the mean of its divisors is an integer number (5417005670265).

Almost surely, 2^{20120306775257} is an apocalyptic number.

It is an amenable number.

20120306775257 is a deficient number, since it is larger than the sum of its proper divisors (1547715905803).

20120306775257 is a wasteful number, since it uses less digits than its factorization.

20120306775257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547715905802.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 20120306775257 in words is "twenty trillion, one hundred twenty billion, three hundred six million, seven hundred seventy-five thousand, two hundred fifty-seven".