20312102209 has 16 divisors (see below), whose sum is σ = 24730030080. Its totient is φ = 16295305680.

The previous prime is 20312102203. The next prime is 20312102219. The reversal of 20312102209 is 90220121302.

It is a cyclic number.

It is not a de Polignac number, because 20312102209 - 2³ = 20312102201 is a prime.

It is a super-2 number, since 2×20312102209² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20312102209.

It is not an unprimeable number, because it can be changed into a prime (20312102201) 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, 908977 + ... + 931054.

It is an arithmetic number, because the mean of its divisors is an integer number (1545626880).

Almost surely, 2^20312102209 is an apocalyptic number.

It is an amenable number.

20312102209 is a deficient number, since it is larger than the sum of its proper divisors (4417927871).

20312102209 is a wasteful number, since it uses less digits than its factorization.

20312102209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840140.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 20312102209 in words is "twenty billion, three hundred twelve million, one hundred two thousand, two hundred nine".