20205142099 has 4 divisors (see below), whose sum is σ = 20207286736. Its totient is φ = 20202997464.

The previous prime is 20205142091. The next prime is 20205142121. The reversal of 20205142099 is 99024150202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20205142099 - 2³ = 20205142091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20205142091) 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, 1058124 + ... + 1077049.

It is an arithmetic number, because the mean of its divisors is an integer number (5051821684).

Almost surely, 2^20205142099 is an apocalyptic number.

20205142099 is a deficient number, since it is larger than the sum of its proper divisors (2144637).

20205142099 is an equidigital number, since it uses as much as digits as its factorization.

20205142099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144636.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 20205142099 in words is "twenty billion, two hundred five million, one hundred forty-two thousand, ninety-nine".