820140402 has 64 divisors (see below), whose sum is σ = 1727308800. Its totient is φ = 259296000.

The previous prime is 820140397. The next prime is 820140403. The reversal of 820140402 is 204041028.

It is not an unprimeable number, because it can be changed into a prime (820140403) 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, 2798968 + ... + 2799260.

It is an arithmetic number, because the mean of its divisors is an integer number (26989200).

Almost surely, 2^820140402 is an apocalyptic number.

820140402 is an abundant number, since it is smaller than the sum of its proper divisors (907168398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820140402 is a wasteful number, since it uses less digits than its factorization.

820140402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 820140402 is about 28638.0935468826. The cubic root of 820140402 is about 936.0435799528.

The spelling of 820140402 in words is "eight hundred twenty million, one hundred forty thousand, four hundred two".