820243130029 has 4 divisors (see below), whose sum is σ = 833689738780. Its totient is φ = 806796521280.

The previous prime is 820243130023. The next prime is 820243130033. The reversal of 820243130029 is 920031342028.

It is a happy number.

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 272694928804 + 547548201225 = 522202^2 + 739965^2 .

It is not a de Polignac number, because 820243130029 - 2²³ = 820234741421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820243129976 and 820243130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820243130023) 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, 6723304284 + ... + 6723304405.

It is an arithmetic number, because the mean of its divisors is an integer number (208422434695).

Almost surely, 2^820243130029 is an apocalyptic number.

It is an amenable number.

820243130029 is a deficient number, since it is larger than the sum of its proper divisors (13446608751).

820243130029 is a wasteful number, since it uses less digits than its factorization.

820243130029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13446608750.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 820243130029 in words is "eight hundred twenty billion, two hundred forty-three million, one hundred thirty thousand, twenty-nine".