20320420121345 has 16 divisors (see below), whose sum is σ = 25444827682560. Its totient is φ = 15549460833984.

The previous prime is 20320420121311. The next prime is 20320420121347. The reversal of 20320420121345 is 54312102402302.

It is a cyclic number.

It is not a de Polignac number, because 20320420121345 - 2¹⁰ = 20320420120321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20320420121347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34469807 + ... + 35054363.

It is an arithmetic number, because the mean of its divisors is an integer number (1590301730160).

Almost surely, 2^{20320420121345} is an apocalyptic number.

It is an amenable number.

20320420121345 is a deficient number, since it is larger than the sum of its proper divisors (5124407561215).

20320420121345 is a wasteful number, since it uses less digits than its factorization.

20320420121345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886864.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 20320420121345 its reverse (54312102402302), we get a palindrome (74632522523647).

The spelling of 20320420121345 in words is "twenty trillion, three hundred twenty billion, four hundred twenty million, one hundred twenty-one thousand, three hundred forty-five".