20320155399 has 8 divisors (see below), whose sum is σ = 27094224112. Its totient is φ = 13546428480.

The previous prime is 20320155371. The next prime is 20320155413. The reversal of 20320155399 is 99355102302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20320155399 - 2⁸ = 20320155143 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 (20320155329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133209 + ... + 241629.

It is an arithmetic number, because the mean of its divisors is an integer number (3386778014).

Almost surely, 2^20320155399 is an apocalyptic number.

20320155399 is a deficient number, since it is larger than the sum of its proper divisors (6774068713).

20320155399 is a wasteful number, since it uses less digits than its factorization.

20320155399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170897.

The product of its (nonzero) digits is 72900, while the sum is 39.

The spelling of 20320155399 in words is "twenty billion, three hundred twenty million, one hundred fifty-five thousand, three hundred ninety-nine".