20010131309 has 4 divisors (see below), whose sum is σ = 22868721504. Its totient is φ = 17151541116.

The previous prime is 20010131293. The next prime is 20010131321. The reversal of 20010131309 is 90313101002.

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 not a de Polignac number, because 20010131309 - 2⁴ = 20010131293 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 (20010131329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429295087 + ... + 1429295100.

It is an arithmetic number, because the mean of its divisors is an integer number (5717180376).

Almost surely, 2^20010131309 is an apocalyptic number.

It is an amenable number.

20010131309 is a deficient number, since it is larger than the sum of its proper divisors (2858590195).

20010131309 is an equidigital number, since it uses as much as digits as its factorization.

20010131309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858590194.

The product of its (nonzero) digits is 162, while the sum is 20.

The spelling of 20010131309 in words is "twenty billion, ten million, one hundred thirty-one thousand, three hundred nine".