2001720016 has 20 divisors (see below), whose sum is σ = 3882536100. Its totient is φ = 999775232.

The previous prime is 2001719987. The next prime is 2001720023. The reversal of 2001720016 is 6100271002.

It can be written as a sum of positive squares in 2 ways, for example, as 932691600 + 1069028416 = 30540^2 + 32696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2001719975 and 2001720002.

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, 52471 + ... + 82198.

It is an arithmetic number, because the mean of its divisors is an integer number (194126805).

Almost surely, 2^2001720016 is an apocalyptic number.

It is an amenable number.

2001720016 is a deficient number, since it is larger than the sum of its proper divisors (1880816084).

2001720016 is a wasteful number, since it uses less digits than its factorization.

2001720016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135606 (or 135600 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 2001720016 is about 44740.5857806980. The cubic root of 2001720016 is about 1260.2821271323.

Adding to 2001720016 its reverse (6100271002), we get a palindrome (8101991018).

The spelling of 2001720016 in words is "two billion, one million, seven hundred twenty thousand, sixteen".