20344515211 has 4 divisors (see below), whose sum is σ = 20602040800. Its totient is φ = 20086989624.

The previous prime is 20344515187. The next prime is 20344515229. The reversal of 20344515211 is 11251544302.

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 20344515211 - 2¹⁵ = 20344482443 is a prime.

It is a super-2 number, since 2×20344515211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20344515211.

It is not an unprimeable number, because it can be changed into a prime (20344515271) 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, 128762676 + ... + 128762833.

It is an arithmetic number, because the mean of its divisors is an integer number (5150510200).

Almost surely, 2^20344515211 is an apocalyptic number.

20344515211 is a deficient number, since it is larger than the sum of its proper divisors (257525589).

20344515211 is an equidigital number, since it uses as much as digits as its factorization.

20344515211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257525588.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 20344515211 in words is "twenty billion, three hundred forty-four million, five hundred fifteen thousand, two hundred eleven".