686434400020 has 24 divisors (see below), whose sum is σ = 1441547452800. Its totient is φ = 274567052832.

The previous prime is 686434400017. The next prime is 686434400021. The reversal of 686434400020 is 20004434686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686434400021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465561 + ... + 1260799.

It is an arithmetic number, because the mean of its divisors is an integer number (60064477200).

Almost surely, 2^686434400020 is an apocalyptic number.

It is an amenable number.

686434400020 is an abundant number, since it is smaller than the sum of its proper divisors (755113052780).

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

686434400020 is a wasteful number, since it uses less digits than its factorization.

686434400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838407 (or 838405 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 686434400020 in words is "six hundred eighty-six billion, four hundred thirty-four million, four hundred thousand, twenty".