20028145103 has 4 divisors (see below), whose sum is σ = 20569446360. Its totient is φ = 19486843848.

The previous prime is 20028145051. The next prime is 20028145127. The reversal of 20028145103 is 30154182002.

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 20028145103 - 2²⁰ = 20027096527 is a prime.

It is a super-2 number, since 2×20028145103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028145153) 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, 270650573 + ... + 270650646.

It is an arithmetic number, because the mean of its divisors is an integer number (5142361590).

Almost surely, 2^20028145103 is an apocalyptic number.

20028145103 is a deficient number, since it is larger than the sum of its proper divisors (541301257).

20028145103 is an equidigital number, since it uses as much as digits as its factorization.

20028145103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541301256.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 20028145103 in words is "twenty billion, twenty-eight million, one hundred forty-five thousand, one hundred three".