820699055 has 32 divisors (see below), whose sum is σ = 1149422400. Its totient is φ = 555909120.

The previous prime is 820699049. The next prime is 820699057. The reversal of 820699055 is 550996028.

It is not a de Polignac number, because 820699055 - 2¹⁰ = 820698031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 820698997 and 820699015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820699057) 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, 86171 + ... + 95219.

It is an arithmetic number, because the mean of its divisors is an integer number (35919450).

Almost surely, 2^820699055 is an apocalyptic number.

820699055 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

820699055 is a deficient number, since it is larger than the sum of its proper divisors (328723345).

820699055 is a wasteful number, since it uses less digits than its factorization.

820699055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 820699055 is about 28647.8455559925. The cubic root of 820699055 is about 936.2560658738.

The spelling of 820699055 in words is "eight hundred twenty million, six hundred ninety-nine thousand, fifty-five".