820051705 has 32 divisors (see below), whose sum is σ = 1125912960. Its totient is φ = 567866880.

The previous prime is 820051699. The next prime is 820051709. The reversal of 820051705 is 507150028.

It is not a de Polignac number, because 820051705 - 2³ = 820051697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820051709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112914 + ... + 119956.

It is an arithmetic number, because the mean of its divisors is an integer number (35184780).

Almost surely, 2^820051705 is an apocalyptic number.

It is an amenable number.

820051705 is a deficient number, since it is larger than the sum of its proper divisors (305861255).

820051705 is a wasteful number, since it uses less digits than its factorization.

820051705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 820051705 is about 28636.5449207826. The cubic root of 820051705 is about 936.0098348158.

The spelling of 820051705 in words is "eight hundred twenty million, fifty-one thousand, seven hundred five".