20549466697 has 8 divisors (see below), whose sum is σ = 20596438280. Its totient is φ = 20502547200.

The previous prime is 20549466677. The next prime is 20549466709. The reversal of 20549466697 is 79666494502.

It can be written as a sum of positive squares in 4 ways, for example, as 894548281 + 19654918416 = 29909^2 + 140196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20549466697 - 2⁷ = 20549466569 is a prime.

It is a super-2 number, since 2×20549466697² (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 (20549466647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839443 + ... + 863575.

It is an arithmetic number, because the mean of its divisors is an integer number (2574554785).

Almost surely, 2^20549466697 is an apocalyptic number.

It is an amenable number.

20549466697 is a deficient number, since it is larger than the sum of its proper divisors (46971583).

20549466697 is a wasteful number, since it uses less digits than its factorization.

20549466697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26043.

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 20549466697 in words is "twenty billion, five hundred forty-nine million, four hundred sixty-six thousand, six hundred ninety-seven".