20399636885 has 8 divisors (see below), whose sum is σ = 24480368640. Its totient is φ = 16319173264.

The previous prime is 20399636849. The next prime is 20399636909. The reversal of 20399636885 is 58863699302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20399636885 - 2¹² = 20399632789 is a prime.

It is a super-2 number, since 2×20399636885² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189836 + ... + 277194.

It is an arithmetic number, because the mean of its divisors is an integer number (3060046080).

Almost surely, 2^20399636885 is an apocalyptic number.

It is an amenable number.

20399636885 is a deficient number, since it is larger than the sum of its proper divisors (4080731755).

20399636885 is an equidigital number, since it uses as much as digits as its factorization.

20399636885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134067.

The product of its (nonzero) digits is 16796160, while the sum is 59.

The spelling of 20399636885 in words is "twenty billion, three hundred ninety-nine million, six hundred thirty-six thousand, eight hundred eighty-five".