20013131219 has 4 divisors (see below), whose sum is σ = 20013532296. Its totient is φ = 20012730144.

The previous prime is 20013131213. The next prime is 20013131231. The reversal of 20013131219 is 91213131002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013131219 is a prime.

It is a super-2 number, since 2×20013131219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013131194 and 20013131203.

It is not an unprimeable number, because it can be changed into a prime (20013131213) 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, 112934 + ... + 229739.

It is an arithmetic number, because the mean of its divisors is an integer number (5003383074).

Almost surely, 2^20013131219 is an apocalyptic number.

20013131219 is a deficient number, since it is larger than the sum of its proper divisors (401077).

20013131219 is an equidigital number, since it uses as much as digits as its factorization.

20013131219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401076.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 20013131219 in words is "twenty billion, thirteen million, one hundred thirty-one thousand, two hundred nineteen".