20423525146513 has 4 divisors (see below), whose sum is σ = 21082348538368. Its totient is φ = 19764701754660.

The previous prime is 20423525146469. The next prime is 20423525146517. The reversal of 20423525146513 is 31564152532402.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423525146513 is a prime.

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 20423525146513.

It is not an unprimeable number, because it can be changed into a prime (20423525146517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329411695881 + ... + 329411695942.

It is an arithmetic number, because the mean of its divisors is an integer number (5270587134592).

Almost surely, 2^{20423525146513} is an apocalyptic number.

It is an amenable number.

20423525146513 is a deficient number, since it is larger than the sum of its proper divisors (658823391855).

20423525146513 is an equidigital number, since it uses as much as digits as its factorization.

20423525146513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658823391854.

The product of its (nonzero) digits is 864000, while the sum is 43.

Adding to 20423525146513 its reverse (31564152532402), we get a palindrome (51987677678915).

The spelling of 20423525146513 in words is "twenty trillion, four hundred twenty-three billion, five hundred twenty-five million, one hundred forty-six thousand, five hundred thirteen".