20435580961 has 4 divisors (see below), whose sum is σ = 20781946800. Its totient is φ = 20089215124.

The previous prime is 20435580943. The next prime is 20435580973. The reversal of 20435580961 is 16908553402.

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 20435580961 - 2⁷ = 20435580833 is a prime.

It is a super-2 number, since 2×20435580961² (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 (20435580911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173182831 + ... + 173182948.

It is an arithmetic number, because the mean of its divisors is an integer number (5195486700).

Almost surely, 2^20435580961 is an apocalyptic number.

It is an amenable number.

20435580961 is a deficient number, since it is larger than the sum of its proper divisors (346365839).

20435580961 is an equidigital number, since it uses as much as digits as its factorization.

20435580961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346365838.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 20435580961 in words is "twenty billion, four hundred thirty-five million, five hundred eighty thousand, nine hundred sixty-one".