20202681961 has 8 divisors (see below), whose sum is σ = 25187759424. Its totient is φ = 15742349520.

The previous prime is 20202681949. The next prime is 20202681991. The reversal of 20202681961 is 16918620202.

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-20202681961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20202681961.

It is not an unprimeable number, because it can be changed into a prime (20202681991) 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 7 ways as a sum of consecutive naturals, for example, 131186170 + ... + 131186323.

It is an arithmetic number, because the mean of its divisors is an integer number (3148469928).

Almost surely, 2^20202681961 is an apocalyptic number.

It is an amenable number.

20202681961 is a deficient number, since it is larger than the sum of its proper divisors (4985077463).

20202681961 is a wasteful number, since it uses less digits than its factorization.

20202681961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262372511.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 20202681961 in words is "twenty billion, two hundred two million, six hundred eighty-one thousand, nine hundred sixty-one".