20153344243 has 4 divisors (see below), whose sum is σ = 20243718208. Its totient is φ = 20062970280.

The previous prime is 20153344241. The next prime is 20153344259. The reversal of 20153344243 is 34244335102.

It is a happy number.

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 20153344243 - 2¹ = 20153344241 is a prime.

It is a super-2 number, since 2×20153344243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20153344241) 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, 45186648 + ... + 45187093.

It is an arithmetic number, because the mean of its divisors is an integer number (5060929552).

Almost surely, 2^20153344243 is an apocalyptic number.

20153344243 is a deficient number, since it is larger than the sum of its proper divisors (90373965).

20153344243 is an equidigital number, since it uses as much as digits as its factorization.

20153344243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90373964.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 20153344243 its reverse (34244335102), we get a palindrome (54397679345).

The spelling of 20153344243 in words is "twenty billion, one hundred fifty-three million, three hundred forty-four thousand, two hundred forty-three".