20102109 has 16 divisors (see below), whose sum is σ = 28469952. Its totient is φ = 12572928.

The previous prime is 20102099. The next prime is 20102111. The reversal of 20102109 is 90120102.

It is a happy number.

It is not a de Polignac number, because 20102109 - 2¹³ = 20093917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30942 + ... + 31584.

It is an arithmetic number, because the mean of its divisors is an integer number (1779372).

Almost surely, 2^20102109 is an apocalyptic number.

It is an amenable number.

20102109 is a deficient number, since it is larger than the sum of its proper divisors (8367843).

20102109 is a wasteful number, since it uses less digits than its factorization.

20102109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20102109 is about 4483.5375542087. The cubic root of 20102109 is about 271.9029218515.

The spelling of 20102109 in words is "twenty million, one hundred two thousand, one hundred nine".