1660201920 has 420 divisors, whose sum is σ = 6411727080. Its totient is φ = 407586816.

The previous prime is 1660201901. The next prime is 1660201927. The reversal of 1660201920 is 291020661.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660201927) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4380291 + ... + 4380669.

Almost surely, 2^1660201920 is an apocalyptic number.

1660201920 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 1660201920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3205863540).

1660201920 is an abundant number, since it is smaller than the sum of its proper divisors (4751525160).

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

1660201920 is a wasteful number, since it uses less digits than its factorization.

1660201920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1660201920 is about 40745.5754653189. The cubic root of 1660201920 is about 1184.0961542314.

The spelling of 1660201920 in words is "one billion, six hundred sixty million, two hundred one thousand, nine hundred twenty".