170020890 has 128 divisors (see below), whose sum is σ = 497145600. Its totient is φ = 41091840.

The previous prime is 170020889. The next prime is 170020897. The reversal of 170020890 is 98020071.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (170020897) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206680 + ... + 207500.

It is an arithmetic number, because the mean of its divisors is an integer number (3883950).

Almost surely, 2^170020890 is an apocalyptic number.

170020890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 170020890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248572800).

170020890 is an abundant number, since it is smaller than the sum of its proper divisors (327124710).

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

170020890 is a wasteful number, since it uses less digits than its factorization.

170020890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 170020890 is about 13039.2058807276. The cubic root of 170020890 is about 553.9885156208.

The spelling of 170020890 in words is "one hundred seventy million, twenty thousand, eight hundred ninety".