20904923770 has 8 divisors (see below), whose sum is σ = 37628862804. Its totient is φ = 8361969504.

The previous prime is 20904923759. The next prime is 20904923771. The reversal of 20904923770 is 7732940902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20291717601 + 613206169 = 142449^2 + 24763^2 .

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

It is a super-2 number, since 2×20904923770² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20904923771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045246179 + ... + 1045246198.

Almost surely, 2^20904923770 is an apocalyptic number.

20904923770 is a deficient number, since it is larger than the sum of its proper divisors (16723939034).

20904923770 is a wasteful number, since it uses less digits than its factorization.

20904923770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090492384.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 20904923770 in words is "twenty billion, nine hundred four million, nine hundred twenty-three thousand, seven hundred seventy".