20120344345 has 8 divisors (see below), whose sum is σ = 24147246600. Its totient is φ = 16094386560.

The previous prime is 20120344331. The next prime is 20120344403. The reversal of 20120344345 is 54344302102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5765668624 + 14354675721 = 75932^2 + 119811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20120344345 - 2⁹ = 20120343833 is a prime.

It is a super-2 number, since 2×20120344345² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188370 + ... + 275179.

It is an arithmetic number, because the mean of its divisors is an integer number (3018405825).

Almost surely, 2^20120344345 is an apocalyptic number.

It is an amenable number.

20120344345 is a deficient number, since it is larger than the sum of its proper divisors (4026902255).

20120344345 is an equidigital number, since it uses as much as digits as its factorization.

20120344345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472235.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20120344345 its reverse (54344302102), we get a palindrome (74464646447).

The spelling of 20120344345 in words is "twenty billion, one hundred twenty million, three hundred forty-four thousand, three hundred forty-five".