20030011523 has 4 divisors (see below), whose sum is σ = 20037074640. Its totient is φ = 20022948408.

The previous prime is 20030011517. The next prime is 20030011543. The reversal of 20030011523 is 32511003002.

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 20030011523 - 2¹⁸ = 20029749379 is a prime.

It is a super-2 number, since 2×20030011523² (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 (20030011513) 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, 3527303 + ... + 3532976.

It is an arithmetic number, because the mean of its divisors is an integer number (5009268660).

Almost surely, 2^20030011523 is an apocalyptic number.

20030011523 is a deficient number, since it is larger than the sum of its proper divisors (7063117).

20030011523 is an equidigital number, since it uses as much as digits as its factorization.

20030011523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7063116.

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 20030011523 its reverse (32511003002), we get a palindrome (52541014525).

The spelling of 20030011523 in words is "twenty billion, thirty million, eleven thousand, five hundred twenty-three".