1665432020 has 48 divisors (see below), whose sum is σ = 4010160000. Its totient is φ = 569130624.

The previous prime is 1665432007. The next prime is 1665432031. The reversal of 1665432020 is 202345661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23606 + ... + 62354.

It is an arithmetic number, because the mean of its divisors is an integer number (83545000).

Almost surely, 2^1665432020 is an apocalyptic number.

1665432020 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 1665432020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005080000).

1665432020 is an abundant number, since it is smaller than the sum of its proper divisors (2344727980).

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

1665432020 is a wasteful number, since it uses less digits than its factorization.

1665432020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39072 (or 39070 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1665432020 is about 40809.7049732046. The cubic root of 1665432020 is about 1185.3382620767.

Adding to 1665432020 its reverse (202345661), we get a palindrome (1867777681).

The spelling of 1665432020 in words is "one billion, six hundred sixty-five million, four hundred thirty-two thousand, twenty".