820540293 has 4 divisors (see below), whose sum is σ = 1094053728. Its totient is φ = 547026860.

The previous prime is 820540291. The next prime is 820540313. The reversal of 820540293 is 392045028.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 820540293 - 2¹ = 820540291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820540291) 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, 136756713 + ... + 136756718.

It is an arithmetic number, because the mean of its divisors is an integer number (273513432).

Almost surely, 2^820540293 is an apocalyptic number.

It is an amenable number.

820540293 is a deficient number, since it is larger than the sum of its proper divisors (273513435).

820540293 is a wasteful number, since it uses less digits than its factorization.

820540293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273513434.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 820540293 is about 28645.0744980703. The cubic root of 820540293 is about 936.1956899173.

The spelling of 820540293 in words is "eight hundred twenty million, five hundred forty thousand, two hundred ninety-three".