20661302100 has 36 divisors (see below), whose sum is σ = 59780034944. Its totient is φ = 5509680480.

The previous prime is 20661302027. The next prime is 20661302141. The reversal of 20661302100 is 120316602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34435204 + ... + 34435803.

Almost surely, 2^20661302100 is an apocalyptic number.

20661302100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20661302100 is an abundant number, since it is smaller than the sum of its proper divisors (39118732844).

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

20661302100 is a wasteful number, since it uses less digits than its factorization.

20661302100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68871024 (or 68871017 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20661302100 its reverse (120316602), we get a palindrome (20781618702).

The spelling of 20661302100 in words is "twenty billion, six hundred sixty-one million, three hundred two thousand, one hundred".