20169762049 has 4 divisors (see below), whose sum is σ = 20170058836. Its totient is φ = 20169465264.

The previous prime is 20169762029. The next prime is 20169762059. The reversal of 20169762049 is 94026796102.

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 2 ways, for example, as 2865675024 + 17304087025 = 53532^2 + 131545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20169762049 is a prime.

It is a super-2 number, since 2×20169762049² (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 (20169762029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9667 + ... + 201079.

It is an arithmetic number, because the mean of its divisors is an integer number (5042514709).

Almost surely, 2^20169762049 is an apocalyptic number.

It is an amenable number.

20169762049 is a deficient number, since it is larger than the sum of its proper divisors (296787).

20169762049 is a wasteful number, since it uses less digits than its factorization.

20169762049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296786.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 20169762049 in words is "twenty billion, one hundred sixty-nine million, seven hundred sixty-two thousand, forty-nine".