20539762489 has 15 divisors (see below), whose sum is σ = 21735600927. Its totient is φ = 19409707944.

The previous prime is 20539762487. The next prime is 20539762493. The reversal of 20539762489 is 98426793502.

The square root of 20539762489 is 143317.

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

It can be written as a sum of positive squares in only one way, i.e., 13765155625 + 6774606864 = 117325^2 + 82308^2 .

It is not a de Polignac number, because 20539762489 - 2¹ = 20539762487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20539762483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 51737239 + ... + 51737635.

Almost surely, 2^20539762489 is an apocalyptic number.

20539762489 is the 143317-th square number.

20539762489 is the 71659-th centered octagonal number.

It is an amenable number.

20539762489 is a deficient number, since it is larger than the sum of its proper divisors (1195838438).

20539762489 is an frugal number, since it uses more digits than its factorization.

20539762489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 20539762489 in words is "twenty billion, five hundred thirty-nine million, seven hundred sixty-two thousand, four hundred eighty-nine".