20788064528449 has 3 divisors (see below), whose sum is σ = 20788069087843. Its totient is φ = 20788059969056.

The previous prime is 20788064528423. The next prime is 20788064528453. The reversal of 20788064528449 is 94482546088702.

The square root of 20788064528449 is 4559393.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 259625916225 + 20528438612224 = 509535^2 + 4530832^2 .

It is not a de Polignac number, because 20788064528449 - 2⁴³ = 11991971506241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20788064528419) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2279697 + ... + 6839089.

Almost surely, 2^{20788064528449} is an apocalyptic number.

20788064528449 is the 4559393-rd square number.

20788064528449 is the 2279697-th centered octagonal number.

It is an amenable number.

20788064528449 is a deficient number, since it is larger than the sum of its proper divisors (4559394).

20788064528449 is an frugal number, since it uses more digits than its factorization.

20788064528449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9118786 (or 4559393 counting only the distinct ones).

The product of its (nonzero) digits is 247726080, while the sum is 67.

The spelling of 20788064528449 in words is "twenty trillion, seven hundred eighty-eight billion, sixty-four million, five hundred twenty-eight thousand, four hundred forty-nine".