667570020 has 96 divisors (see below), whose sum is σ = 2021967360. Its totient is φ = 163591680.

The previous prime is 667570003. The next prime is 667570049. The reversal of 667570020 is 20075766.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184630 + ... + 188210.

It is an arithmetic number, because the mean of its divisors is an integer number (21062160).

Almost surely, 2^667570020 is an apocalyptic number.

667570020 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 667570020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010983680).

667570020 is an abundant number, since it is smaller than the sum of its proper divisors (1354397340).

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

667570020 is a wasteful number, since it uses less digits than its factorization.

667570020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3843 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 667570020 is about 25837.3764147988. The cubic root of 667570020 is about 873.9748625620.

The spelling of 667570020 in words is "six hundred sixty-seven million, five hundred seventy thousand, twenty".