20865144003 has 16 divisors (see below), whose sum is σ = 30351718656. Its totient is φ = 12644534240.

The previous prime is 20865143863. The next prime is 20865144011. The reversal of 20865144003 is 30044156802.

It is a cyclic number.

It is not a de Polignac number, because 20865144003 - 2⁹ = 20865143491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20865144103) 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, 768325 + ... + 795017.

It is an arithmetic number, because the mean of its divisors is an integer number (1896982416).

Almost surely, 2^20865144003 is an apocalyptic number.

20865144003 is a deficient number, since it is larger than the sum of its proper divisors (9486574653).

20865144003 is a wasteful number, since it uses less digits than its factorization.

20865144003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50394.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 20865144003 in words is "twenty billion, eight hundred sixty-five million, one hundred forty-four thousand, three".