20001223015 has 16 divisors (see below), whose sum is σ = 24844280832. Its totient is φ = 15445914624.

The previous prime is 20001223007. The next prime is 20001223019. The reversal of 20001223015 is 51032210002.

It is not a de Polignac number, because 20001223015 - 2³ = 20001223007 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 20001223015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001223019) 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, 402154 + ... + 449143.

It is an arithmetic number, because the mean of its divisors is an integer number (1552767552).

Almost surely, 2^20001223015 is an apocalyptic number.

20001223015 is a deficient number, since it is larger than the sum of its proper divisors (4843057817).

20001223015 is a wasteful number, since it uses less digits than its factorization.

20001223015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851466.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 20001223015 its reverse (51032210002), we get a palindrome (71033433017).

The spelling of 20001223015 in words is "twenty billion, one million, two hundred twenty-three thousand, fifteen".