161322020 has 24 divisors (see below), whose sum is σ = 339401664. Its totient is φ = 64409696.

The previous prime is 161322019. The next prime is 161322067. The reversal of 161322020 is 20223161.

It is a self number, because there is not a number n which added to its sum of digits gives 161322020.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4097 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (14141736).

Almost surely, 2^161322020 is an apocalyptic number.

161322020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161322020 is an abundant number, since it is smaller than the sum of its proper divisors (178079644).

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

161322020 is a wasteful number, since it uses less digits than its factorization.

161322020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14899 (or 14897 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 161322020 is about 12701.2605673610. The cubic root of 161322020 is about 544.3746383113.

Adding to 161322020 its reverse (20223161), we get a palindrome (181545181).

The spelling of 161322020 in words is "one hundred sixty-one million, three hundred twenty-two thousand, twenty".