20102660 has 12 divisors (see below), whose sum is σ = 42215628. Its totient is φ = 8041056.

The previous prime is 20102659. The next prime is 20102671. The reversal of 20102660 is 6620102.

It can be written as a sum of positive squares in 2 ways, for example, as 8213956 + 11888704 = 2866^2 + 3448^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502547 + ... + 502586.

It is an arithmetic number, because the mean of its divisors is an integer number (3517969).

Almost surely, 2^20102660 is an apocalyptic number.

20102660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102660 is an abundant number, since it is smaller than the sum of its proper divisors (22112968).

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

20102660 is a wasteful number, since it uses less digits than its factorization.

20102660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005142 (or 1005140 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20102660 is about 4483.5990008028. The cubic root of 20102660 is about 271.9054061206.

Adding to 20102660 its reverse (6620102), we get a palindrome (26722762).

The spelling of 20102660 in words is "twenty million, one hundred two thousand, six hundred sixty".