20277354961 has 4 divisors (see below), whose sum is σ = 20505190500. Its totient is φ = 20049519424.

The previous prime is 20277354949. The next prime is 20277355039. The reversal of 20277354961 is 16945377202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7726410000 + 12550944961 = 87900^2 + 112031^2 .

It is a cyclic number.

It is not a de Polignac number, because 20277354961 - 2²⁵ = 20243800529 is a prime.

It is a super-2 number, since 2×20277354961² (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 (20277354931) 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 3 ways as a sum of consecutive naturals, for example, 113917636 + ... + 113917813.

It is an arithmetic number, because the mean of its divisors is an integer number (5126297625).

Almost surely, 2^20277354961 is an apocalyptic number.

It is an amenable number.

20277354961 is a deficient number, since it is larger than the sum of its proper divisors (227835539).

20277354961 is an equidigital number, since it uses as much as digits as its factorization.

20277354961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227835538.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 20277354961 in words is "twenty billion, two hundred seventy-seven million, three hundred fifty-four thousand, nine hundred sixty-one".