20015412123 has 16 divisors (see below), whose sum is σ = 30929250816. Its totient is φ = 11276287680.

The previous prime is 20015412073. The next prime is 20015412127. The reversal of 20015412123 is 32121451002.

It is not a de Polignac number, because 20015412123 - 2²⁰ = 20014363547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20015412123.

It is not an unprimeable number, because it can be changed into a prime (20015412127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6710586 + ... + 6713567.

It is an arithmetic number, because the mean of its divisors is an integer number (1933078176).

Almost surely, 2^20015412123 is an apocalyptic number.

20015412123 is a deficient number, since it is larger than the sum of its proper divisors (10913838693).

20015412123 is a wasteful number, since it uses less digits than its factorization.

20015412123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13424234.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20015412123 its reverse (32121451002), we get a palindrome (52136863125).

The spelling of 20015412123 in words is "twenty billion, fifteen million, four hundred twelve thousand, one hundred twenty-three".