20829142878807 has 4 divisors (see below), whose sum is σ = 27772190505080. Its totient is φ = 13886095252536.

The previous prime is 20829142878799. The next prime is 20829142878811. The reversal of 20829142878807 is 70887824192802.

It is a happy number.

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

It is not a de Polignac number, because 20829142878807 - 2³ = 20829142878799 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 (20829142878857) 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, 3471523813132 + ... + 3471523813137.

It is an arithmetic number, because the mean of its divisors is an integer number (6943047626270).

Almost surely, 2^{20829142878807} is an apocalyptic number.

20829142878807 is a deficient number, since it is larger than the sum of its proper divisors (6943047626273).

20829142878807 is an equidigital number, since it uses as much as digits as its factorization.

20829142878807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6943047626272.

The product of its (nonzero) digits is 57802752, while the sum is 66.

The spelling of 20829142878807 in words is "twenty trillion, eight hundred twenty-nine billion, one hundred forty-two million, eight hundred seventy-eight thousand, eight hundred seven".