20492201918561 has 8 divisors (see below), whose sum is σ = 21383365319424. Its totient is φ = 19601055026080.

The previous prime is 20492201918557. The next prime is 20492201918563. The reversal of 20492201918561 is 16581910229402.

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 20492201918561 - 2² = 20492201918557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20492201918563) 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, 1556396 + ... + 6588381.

It is an arithmetic number, because the mean of its divisors is an integer number (2672920664928).

Almost surely, 2^{20492201918561} is an apocalyptic number.

It is an amenable number.

20492201918561 is a deficient number, since it is larger than the sum of its proper divisors (891163400863).

20492201918561 is a wasteful number, since it uses less digits than its factorization.

20492201918561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8254191.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 20492201918561 in words is "twenty trillion, four hundred ninety-two billion, two hundred one million, nine hundred eighteen thousand, five hundred sixty-one".