161120020 has 48 divisors (see below), whose sum is σ = 351783936. Its totient is φ = 61920000.

The previous prime is 161120017. The next prime is 161120021. The reversal of 161120020 is 20021161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161120021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92760 + ... + 94480.

It is an arithmetic number, because the mean of its divisors is an integer number (7328832).

Almost surely, 2^161120020 is an apocalyptic number.

161120020 is a gapful number since it is divisible by the number (10) 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 161120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175891968).

161120020 is an abundant number, since it is smaller than the sum of its proper divisors (190663916).

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

161120020 is a wasteful number, since it uses less digits than its factorization.

161120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912 (or 1910 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 161120020 is about 12693.3061099148. The cubic root of 161120020 is about 544.1473297971.

Adding to 161120020 its reverse (20021161), we get a palindrome (181141181).

The spelling of 161120020 in words is "one hundred sixty-one million, one hundred twenty thousand, twenty".