170640020 has 24 divisors (see below), whose sum is σ = 358591968. Its totient is φ = 68208800.

The previous prime is 170639981. The next prime is 170640023. The reversal of 170640020 is 20046071.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 170639974 and 170640001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170640023) 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, 48935 + ... + 52305.

It is an arithmetic number, because the mean of its divisors is an integer number (14941332).

Almost surely, 2^170640020 is an apocalyptic number.

170640020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

170640020 is an abundant number, since it is smaller than the sum of its proper divisors (187951948).

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

170640020 is a wasteful number, since it uses less digits than its factorization.

170640020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911 (or 5909 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 170640020 is about 13062.9253997717. The cubic root of 170640020 is about 554.6601495924.

Adding to 170640020 its reverse (20046071), we get a palindrome (190686091).

The spelling of 170640020 in words is "one hundred seventy million, six hundred forty thousand, twenty".