20696562769 has 9 divisors (see below), whose sum is σ = 20809822939. Its totient is φ = 20583918040.

The previous prime is 20696562751. The next prime is 20696562781. The reversal of 20696562769 is 96726569602.

The square root of 20696562769 is 143863.

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., 19581804225 + 1114758544 = 139935^2 + 33388^2 .

It is not a de Polignac number, because 20696562769 - 2⁷ = 20696562641 is a prime.

It is a super-2 number, since 2×20696562769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20696592769) 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 8 ways as a sum of consecutive naturals, for example, 42151614 + ... + 42152104.

Almost surely, 2^20696562769 is an apocalyptic number.

20696562769 is the 143863-rd square number.

20696562769 is the 71932-nd centered octagonal number.

It is an amenable number.

20696562769 is a deficient number, since it is larger than the sum of its proper divisors (113260170).

20696562769 is an frugal number, since it uses more digits than its factorization.

20696562769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 20696562769 in words is "twenty billion, six hundred ninety-six million, five hundred sixty-two thousand, seven hundred sixty-nine".