20561426441 has 8 divisors (see below), whose sum is σ = 22916760480. Its totient is φ = 18333407808.

The previous prime is 20561426423. The next prime is 20561426461. The reversal of 20561426441 is 14462416502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20561426441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20561426461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31828511 + ... + 31829156.

It is an arithmetic number, because the mean of its divisors is an integer number (2864595060).

Almost surely, 2^20561426441 is an apocalyptic number.

It is an amenable number.

20561426441 is a deficient number, since it is larger than the sum of its proper divisors (2355334039).

20561426441 is a wasteful number, since it uses less digits than its factorization.

20561426441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63657703.

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 20561426441 in words is "twenty billion, five hundred sixty-one million, four hundred twenty-six thousand, four hundred forty-one".