20012002109 has 4 divisors (see below), whose sum is σ = 21831275040. Its totient is φ = 18192729180.

The previous prime is 20012002091. The next prime is 20012002147. The reversal of 20012002109 is 90120021002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012002109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012002159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909636449 + ... + 909636470.

It is an arithmetic number, because the mean of its divisors is an integer number (5457818760).

Almost surely, 2^20012002109 is an apocalyptic number.

It is an amenable number.

20012002109 is a deficient number, since it is larger than the sum of its proper divisors (1819272931).

20012002109 is a wasteful number, since it uses less digits than its factorization.

20012002109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819272930.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20012002109 in words is "twenty billion, twelve million, two thousand, one hundred nine".