20931840001 has 4 divisors (see below), whose sum is σ = 20932278192. Its totient is φ = 20931401812.

The previous prime is 20931839993. The next prime is 20931840047. The reversal of 20931840001 is 10004813902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20931840001 - 2³ = 20931839993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20931843001) 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, 137251 + ... + 246376.

It is an arithmetic number, because the mean of its divisors is an integer number (5233069548).

Almost surely, 2^20931840001 is an apocalyptic number.

It is an amenable number.

20931840001 is a deficient number, since it is larger than the sum of its proper divisors (438191).

20931840001 is an equidigital number, since it uses as much as digits as its factorization.

20931840001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438190.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 20931840001 in words is "twenty billion, nine hundred thirty-one million, eight hundred forty thousand, one".