820004737 has 4 divisors (see below), whose sum is σ = 820066240. Its totient is φ = 819943236.

The previous prime is 820004687. The next prime is 820004747. The reversal of 820004737 is 737400028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 820004737 - 2²³ = 811616129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820004699 and 820004708.

It is not an unprimeable number, because it can be changed into a prime (820004747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437 + ... + 40522.

It is an arithmetic number, because the mean of its divisors is an integer number (205016560).

Almost surely, 2^820004737 is an apocalyptic number.

It is an amenable number.

820004737 is a deficient number, since it is larger than the sum of its proper divisors (61503).

820004737 is a wasteful number, since it uses less digits than its factorization.

820004737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61502.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 820004737 is about 28635.7248380410. The cubic root of 820004737 is about 935.9919646624.

The spelling of 820004737 in words is "eight hundred twenty million, four thousand, seven hundred thirty-seven".