1606172020 has 24 divisors (see below), whose sum is σ = 3383750664. Its totient is φ = 640413696.

The previous prime is 1606171979. The next prime is 1606172021. The reversal of 1606172020 is 202716061.

It can be written as a sum of positive squares in 4 ways, for example, as 94828644 + 1511343376 = 9738^2 + 38876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606172021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122029 + ... + 134548.

It is an arithmetic number, because the mean of its divisors is an integer number (140989611).

Almost surely, 2^1606172020 is an apocalyptic number.

1606172020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1606172020 is an abundant number, since it is smaller than the sum of its proper divisors (1777578644).

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

1606172020 is a wasteful number, since it uses less digits than its factorization.

1606172020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256899 (or 256897 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1606172020 is about 40077.0759911449. The cubic root of 1606172020 is about 1171.1090902794.

Adding to 1606172020 its reverse (202716061), we get a palindrome (1808888081).

The spelling of 1606172020 in words is "one billion, six hundred six million, one hundred seventy-two thousand, twenty".