820170693 has 12 divisors (see below), whose sum is σ = 1185304588. Its totient is φ = 546497280.

The previous prime is 820170679. The next prime is 820170709. The reversal of 820170693 is 396071028.

It can be written as a sum of positive squares in 2 ways, for example, as 329858244 + 490312449 = 18162^2 + 22143^2 .

It is not a de Polignac number, because 820170693 - 2¹⁶ = 820105157 is a prime.

It is a super-2 number, since 2×820170693² = 1345359931312200498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820170493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4438 + ... + 40743.

Almost surely, 2^820170693 is an apocalyptic number.

It is an amenable number.

820170693 is a deficient number, since it is larger than the sum of its proper divisors (365133895).

820170693 is a wasteful number, since it uses less digits than its factorization.

820170693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47204 (or 47201 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 820170693 is about 28638.6224005276. The cubic root of 820170693 is about 936.0551037305.

The spelling of 820170693 in words is "eight hundred twenty million, one hundred seventy thousand, six hundred ninety-three".