1601747920 has 20 divisors (see below), whose sum is σ = 3724064100. Its totient is φ = 640699136.

The previous prime is 1601747911. The next prime is 1601747933. The reversal of 1601747920 is 297471061.

It can be written as a sum of positive squares in 2 ways, for example, as 177742224 + 1424005696 = 13332^2 + 37736^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1601747920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10010845 + ... + 10011004.

It is an arithmetic number, because the mean of its divisors is an integer number (186203205).

Almost surely, 2^1601747920 is an apocalyptic number.

1601747920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601747920 is an abundant number, since it is smaller than the sum of its proper divisors (2122316180).

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

1601747920 is a wasteful number, since it uses less digits than its factorization.

1601747920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021862 (or 20021856 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 1601747920 is about 40021.8430360222. The cubic root of 1601747920 is about 1170.0328527069.

The spelling of 1601747920 in words is "one billion, six hundred one million, seven hundred forty-seven thousand, nine hundred twenty".