20213140309 has 4 divisors (see below), whose sum is σ = 20490032716. Its totient is φ = 19936247904.

The previous prime is 20213140279. The next prime is 20213140327. The reversal of 20213140309 is 90304131202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11832653284 + 8380487025 = 108778^2 + 91545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213140309 - 2¹³ = 20213132117 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 (20213140349) 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, 138446094 + ... + 138446239.

It is an arithmetic number, because the mean of its divisors is an integer number (5122508179).

Almost surely, 2^20213140309 is an apocalyptic number.

It is an amenable number.

20213140309 is a deficient number, since it is larger than the sum of its proper divisors (276892407).

20213140309 is an equidigital number, since it uses as much as digits as its factorization.

20213140309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276892406.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 20213140309 in words is "twenty billion, two hundred thirteen million, one hundred forty thousand, three hundred nine".