20465213143 has 4 divisors (see below), whose sum is σ = 20466475848. Its totient is φ = 20463950440.

The previous prime is 20465213137. The next prime is 20465213161. The reversal of 20465213143 is 34131256402.

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 20465213143 - 2¹³ = 20465204951 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 (20465213113) 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, 606721 + ... + 639562.

It is an arithmetic number, because the mean of its divisors is an integer number (5116618962).

Almost surely, 2^20465213143 is an apocalyptic number.

20465213143 is a deficient number, since it is larger than the sum of its proper divisors (1262705).

20465213143 is a wasteful number, since it uses less digits than its factorization.

20465213143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262704.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 20465213143 its reverse (34131256402), we get a palindrome (54596469545).

The spelling of 20465213143 in words is "twenty billion, four hundred sixty-five million, two hundred thirteen thousand, one hundred forty-three".