171672020 has 24 divisors (see below), whose sum is σ = 388243464. Its totient is φ = 63386496.

The previous prime is 171672013. The next prime is 171672031. The reversal of 171672020 is 20276171.

It can be written as a sum of positive squares in 4 ways, for example, as 13868176 + 157803844 = 3724^2 + 12562^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329879 + ... + 330398.

It is an arithmetic number, because the mean of its divisors is an integer number (16176811).

Almost surely, 2^171672020 is an apocalyptic number.

171672020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171672020 is an abundant number, since it is smaller than the sum of its proper divisors (216571444).

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

171672020 is a wasteful number, since it uses less digits than its factorization.

171672020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660299 (or 660297 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 171672020 is about 13102.3669617363. The cubic root of 171672020 is about 555.7760644353.

The spelling of 171672020 in words is "one hundred seventy-one million, six hundred seventy-two thousand, twenty".