20400200309 has 32 divisors (see below), whose sum is σ = 21458236800. Its totient is φ = 19379969280.

The previous prime is 20400200299. The next prime is 20400200323. The reversal of 20400200309 is 90300200402.

It is not a de Polignac number, because 20400200309 - 2²⁰ = 20399151733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400200369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112708199 + ... + 112708379.

It is an arithmetic number, because the mean of its divisors is an integer number (670569900).

Almost surely, 2^20400200309 is an apocalyptic number.

It is an amenable number.

20400200309 is a deficient number, since it is larger than the sum of its proper divisors (1058036491).

20400200309 is a wasteful number, since it uses less digits than its factorization.

20400200309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 432, while the sum is 20.

The spelling of 20400200309 in words is "twenty billion, four hundred million, two hundred thousand, three hundred nine".