20353686622981 has 4 divisors (see below), whose sum is σ = 20353712923852. Its totient is φ = 20353660322112.

The previous prime is 20353686622961. The next prime is 20353686622987. The reversal of 20353686622981 is 18922668635302.

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 16092661772356 + 4261024850625 = 4011566^2 + 2064225^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353686622981 - 2⁵ = 20353686622949 is a prime.

It is a super-2 number, since 2×20353686622981² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20353686622987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11953290 + ... + 13549483.

It is an arithmetic number, because the mean of its divisors is an integer number (5088428230963).

Almost surely, 2^{20353686622981} is an apocalyptic number.

It is an amenable number.

20353686622981 is a deficient number, since it is larger than the sum of its proper divisors (26300871).

20353686622981 is an equidigital number, since it uses as much as digits as its factorization.

20353686622981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26300870.

The product of its (nonzero) digits is 44789760, while the sum is 61.

The spelling of 20353686622981 in words is "twenty trillion, three hundred fifty-three billion, six hundred eighty-six million, six hundred twenty-two thousand, nine hundred eighty-one".