20440015213 has 4 divisors (see below), whose sum is σ = 20915364448. Its totient is φ = 19964665980.

The previous prime is 20440015201. The next prime is 20440015217. The reversal of 20440015213 is 31251004402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31251004402 = 2 ⋅15625502201.

It is a cyclic number.

It is not a de Polignac number, because 20440015213 - 2³³ = 11850080621 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 (20440015217) 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, 237674553 + ... + 237674638.

It is an arithmetic number, because the mean of its divisors is an integer number (5228841112).

Almost surely, 2^20440015213 is an apocalyptic number.

It is an amenable number.

20440015213 is a deficient number, since it is larger than the sum of its proper divisors (475349235).

20440015213 is an equidigital number, since it uses as much as digits as its factorization.

20440015213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475349234.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20440015213 its reverse (31251004402), we get a palindrome (51691019615).

The spelling of 20440015213 in words is "twenty billion, four hundred forty million, fifteen thousand, two hundred thirteen".