20210867409 has 4 divisors (see below), whose sum is σ = 26947823216. Its totient is φ = 13473911604.

The previous prime is 20210867393. The next prime is 20210867419. The reversal of 20210867409 is 90476801202.

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 not a de Polignac number, because 20210867409 - 2⁴ = 20210867393 is a prime.

It is a super-2 number, since 2×20210867409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210867419) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3368477899 + ... + 3368477904.

It is an arithmetic number, because the mean of its divisors is an integer number (6736955804).

Almost surely, 2^20210867409 is an apocalyptic number.

It is an amenable number.

20210867409 is a deficient number, since it is larger than the sum of its proper divisors (6736955807).

20210867409 is an equidigital number, since it uses as much as digits as its factorization.

20210867409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736955806.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 20210867409 in words is "twenty billion, two hundred ten million, eight hundred sixty-seven thousand, four hundred nine".