20013770204423 has 4 divisors (see below), whose sum is σ = 20013787866480. Its totient is φ = 20013752542368.

The previous prime is 20013770204377. The next prime is 20013770204497. The reversal of 20013770204423 is 32440207731002.

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 20013770204423 - 2⁴⁴ = 2421584160007 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 (20013770207423) 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, 7005515 + ... + 9439532.

It is an arithmetic number, because the mean of its divisors is an integer number (5003446966620).

Almost surely, 2^{20013770204423} is an apocalyptic number.

20013770204423 is a deficient number, since it is larger than the sum of its proper divisors (17662057).

20013770204423 is a wasteful number, since it uses less digits than its factorization.

20013770204423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17662056.

The product of its (nonzero) digits is 56448, while the sum is 35.

Adding to 20013770204423 its reverse (32440207731002), we get a palindrome (52453977935425).

The spelling of 20013770204423 in words is "twenty trillion, thirteen billion, seven hundred seventy million, two hundred four thousand, four hundred twenty-three".