820020724 has 24 divisors (see below), whose sum is σ = 1455753600. Its totient is φ = 404120640.

The previous prime is 820020713. The next prime is 820020727. The reversal of 820020724 is 427020028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820020727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114357 + ... + 121315.

It is an arithmetic number, because the mean of its divisors is an integer number (60656400).

Almost surely, 2^820020724 is an apocalyptic number.

It is an amenable number.

820020724 is a deficient number, since it is larger than the sum of its proper divisors (635732876).

820020724 is a wasteful number, since it uses less digits than its factorization.

820020724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383 (or 7381 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 820020724 is about 28636.0039810027. The cubic root of 820020724 is about 935.9980473941.

The spelling of 820020724 in words is "eight hundred twenty million, twenty thousand, seven hundred twenty-four".