20120533376557 has 2 divisors, whose sum is σ = 20120533376558. Its totient is φ = 20120533376556.

The previous prime is 20120533376539. The next prime is 20120533376597. The reversal of 20120533376557 is 75567333502102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11215626852676 + 8904906523881 = 3348974^2 + 2984109^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120533376557 - 2¹¹ = 20120533374509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120533376557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120533376597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060266688278 + 10060266688279.

It is an arithmetic number, because the mean of its divisors is an integer number (10060266688279).

Almost surely, 2^{20120533376557} is an apocalyptic number.

It is an amenable number.

20120533376557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120533376557 is an equidigital number, since it uses as much as digits as its factorization.

20120533376557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969000, while the sum is 49.

Adding to 20120533376557 its reverse (75567333502102), we get a palindrome (95687866878659).

The spelling of 20120533376557 in words is "twenty trillion, one hundred twenty billion, five hundred thirty-three million, three hundred seventy-six thousand, five hundred fifty-seven".