20675780794 has 8 divisors (see below), whose sum is σ = 31171101588. Its totient is φ = 10285413600.

The previous prime is 20675780779. The next prime is 20675780821. The reversal of 20675780794 is 49708757602.

It can be written as a sum of positive squares in 2 ways, for example, as 20667800169 + 7980625 = 143763^2 + 2825^2 .

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

It is a super-2 number, since 2×20675780794² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26237907 + ... + 26238694.

Almost surely, 2^20675780794 is an apocalyptic number.

20675780794 is a deficient number, since it is larger than the sum of its proper divisors (10495320794).

20675780794 is a wasteful number, since it uses less digits than its factorization.

20675780794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52476800.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 20675780794 in words is "twenty billion, six hundred seventy-five million, seven hundred eighty thousand, seven hundred ninety-four".