686446020 has 144 divisors (see below), whose sum is σ = 2314970112. Its totient is φ = 163503360.

The previous prime is 686445997. The next prime is 686446027. The reversal of 686446020 is 20644686.

It is a happy number.

686446020 is a `hidden beast` number, since 6 + 8 + 6 + 44 + 602 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (686446027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67809 + ... + 77271.

Almost surely, 2^686446020 is an apocalyptic number.

686446020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686446020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157485056).

686446020 is an abundant number, since it is smaller than the sum of its proper divisors (1628524092).

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

686446020 is a wasteful number, since it uses less digits than its factorization.

686446020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522 (or 9517 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 686446020 is about 26200.1148852443. The cubic root of 686446020 is about 882.1358329679.

The spelling of 686446020 in words is "six hundred eighty-six million, four hundred forty-six thousand, twenty".