161240020 has 12 divisors (see below), whose sum is σ = 338604084. Its totient is φ = 64496000.

The previous prime is 161240017. The next prime is 161240047. The reversal of 161240020 is 20042161.

161240020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 114618436 + 46621584 = 10706^2 + 6828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161239976 and 161240003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4030981 + ... + 4031020.

It is an arithmetic number, because the mean of its divisors is an integer number (28217007).

Almost surely, 2^161240020 is an apocalyptic number.

161240020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161240020 is an abundant number, since it is smaller than the sum of its proper divisors (177364064).

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

161240020 is a wasteful number, since it uses less digits than its factorization.

161240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062010 (or 8062008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 161240020 is about 12698.0321310036. The cubic root of 161240020 is about 544.2823874503.

Adding to 161240020 its reverse (20042161), we get a palindrome (181282181).

The spelling of 161240020 in words is "one hundred sixty-one million, two hundred forty thousand, twenty".