20314427561 has 4 divisors (see below), whose sum is σ = 20746649472. Its totient is φ = 19882205652.

The previous prime is 20314427533. The next prime is 20314427591. The reversal of 20314427561 is 16572441302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20314427561 - 2²² = 20310233257 is a prime.

It is a super-2 number, since 2×20314427561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20314427531) 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 3 ways as a sum of consecutive naturals, for example, 216110885 + ... + 216110978.

It is an arithmetic number, because the mean of its divisors is an integer number (5186662368).

Almost surely, 2^20314427561 is an apocalyptic number.

It is an amenable number.

20314427561 is a deficient number, since it is larger than the sum of its proper divisors (432221911).

20314427561 is an equidigital number, since it uses as much as digits as its factorization.

20314427561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432221910.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 20314427561 its reverse (16572441302), we get a palindrome (36886868863).

The spelling of 20314427561 in words is "twenty billion, three hundred fourteen million, four hundred twenty-seven thousand, five hundred sixty-one".