20958142960261 has 4 divisors (see below), whose sum is σ = 22570307803372. Its totient is φ = 19345978117152.

The previous prime is 20958142960217. The next prime is 20958142960291. The reversal of 20958142960261 is 16206924185902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2222395192900 + 18735747767361 = 1490770^2 + 4328481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20958142960261 - 2¹⁷ = 20958142829189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958142960211) 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, 806082421536 + ... + 806082421561.

It is an arithmetic number, because the mean of its divisors is an integer number (5642576950843).

Almost surely, 2^{20958142960261} is an apocalyptic number.

It is an amenable number.

20958142960261 is a deficient number, since it is larger than the sum of its proper divisors (1612164843111).

20958142960261 is a wasteful number, since it uses less digits than its factorization.

20958142960261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612164843110.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 20958142960261 in words is "twenty trillion, nine hundred fifty-eight billion, one hundred forty-two million, nine hundred sixty thousand, two hundred sixty-one".