820343442 has 16 divisors (see below), whose sum is σ = 1641006432. Its totient is φ = 273394560.

The previous prime is 820343441. The next prime is 820343479. The reversal of 820343442 is 244343028.

It is not an unprimeable number, because it can be changed into a prime (820343441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31842 + ... + 51522.

It is an arithmetic number, because the mean of its divisors is an integer number (102562902).

Almost surely, 2^820343442 is an apocalyptic number.

820343442 is an abundant number, since it is smaller than the sum of its proper divisors (820662990).

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

820343442 is a wasteful number, since it uses less digits than its factorization.

820343442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26633.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 820343442 is about 28641.6382562171. The cubic root of 820343442 is about 936.1208181941.

The spelling of 820343442 in words is "eight hundred twenty million, three hundred forty-three thousand, four hundred forty-two".