20905049794 has 8 divisors (see below), whose sum is σ = 32438870460. Its totient is φ = 10092092976.

The previous prime is 20905049777. The next prime is 20905049797. The reversal of 20905049794 is 49794050902.

It can be written as a sum of positive squares in 2 ways, for example, as 19905541569 + 999508225 = 141087^2 + 31615^2 .

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

It is a super-2 number, since 2×20905049794² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20905049797) 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, 180215889 + ... + 180216004.

Almost surely, 2^20905049794 is an apocalyptic number.

20905049794 is a deficient number, since it is larger than the sum of its proper divisors (11533820666).

20905049794 is a wasteful number, since it uses less digits than its factorization.

20905049794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360431924.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 20905049794 in words is "twenty billion, nine hundred five million, forty-nine thousand, seven hundred ninety-four".