20798734679953 has 4 divisors (see below), whose sum is σ = 20799537342948. Its totient is φ = 20797932016960.

The previous prime is 20798734679851. The next prime is 20798734679971. The reversal of 20798734679953 is 35997643789702.

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 8203000071744 + 12595734608209 = 2864088^2 + 3549047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20798734679953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20798734679993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401292628 + ... + 401344453.

It is an arithmetic number, because the mean of its divisors is an integer number (5199884335737).

Almost surely, 2^{20798734679953} is an apocalyptic number.

It is an amenable number.

20798734679953 is a deficient number, since it is larger than the sum of its proper divisors (802662995).

20798734679953 is an equidigital number, since it uses as much as digits as its factorization.

20798734679953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802662994.

The product of its (nonzero) digits is 4320812160, while the sum is 79.

The spelling of 20798734679953 in words is "twenty trillion, seven hundred ninety-eight billion, seven hundred thirty-four million, six hundred seventy-nine thousand, nine hundred fifty-three".