20399016450 has 24 divisors (see below), whose sum is σ = 50589561168. Its totient is φ = 5439737680.

The previous prime is 20399016389. The next prime is 20399016497. The reversal of 20399016450 is 5461099302.

It is a super-3 number, since 3×20399016450³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20399016399 and 20399016408.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67996572 + ... + 67996871.

It is an arithmetic number, because the mean of its divisors is an integer number (2107898382).

Almost surely, 2^20399016450 is an apocalyptic number.

20399016450 is an abundant number, since it is smaller than the sum of its proper divisors (30190544718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20399016450 is a wasteful number, since it uses less digits than its factorization.

20399016450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135993458 (or 135993453 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 20399016450 in words is "twenty billion, three hundred ninety-nine million, sixteen thousand, four hundred fifty".