20336721890 has 8 divisors (see below), whose sum is σ = 36606099420. Its totient is φ = 8134688752.

The previous prime is 20336721883. The next prime is 20336721893. The reversal of 20336721890 is 9812763302.

It can be written as a sum of positive squares in 2 ways, for example, as 16910141521 + 3426580369 = 130039^2 + 58537^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20336721893) 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, 1016836085 + ... + 1016836104.

Almost surely, 2^20336721890 is an apocalyptic number.

20336721890 is a deficient number, since it is larger than the sum of its proper divisors (16269377530).

20336721890 is a wasteful number, since it uses less digits than its factorization.

20336721890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033672196.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 20336721890 in words is "twenty billion, three hundred thirty-six million, seven hundred twenty-one thousand, eight hundred ninety".