20001400939 has 4 divisors (see below), whose sum is σ = 21539970256. Its totient is φ = 18462831624.

The previous prime is 20001400897. The next prime is 20001400961. The reversal of 20001400939 is 93900410002.

It is a happy number.

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 20001400939 - 2²¹ = 19999303787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001400039) 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, 769284639 + ... + 769284664.

It is an arithmetic number, because the mean of its divisors is an integer number (5384992564).

Almost surely, 2^20001400939 is an apocalyptic number.

20001400939 is a deficient number, since it is larger than the sum of its proper divisors (1538569317).

20001400939 is a wasteful number, since it uses less digits than its factorization.

20001400939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538569316.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 20001400939 in words is "twenty billion, one million, four hundred thousand, nine hundred thirty-nine".