20804923737 has 16 divisors (see below), whose sum is σ = 33193041280. Its totient is φ = 12803029776.

The previous prime is 20804923729. The next prime is 20804923801. The reversal of 20804923737 is 73732940802.

20804923737 is a `hidden beast` number, since 20 + 80 + 492 + 37 + 37 = 666.

It is not a de Polignac number, because 20804923737 - 2³ = 20804923729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20804923692 and 20804923701.

It is not an unprimeable number, because it can be changed into a prime (20804923537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29636293 + ... + 29636994.

It is an arithmetic number, because the mean of its divisors is an integer number (2074565080).

Almost surely, 2^20804923737 is an apocalyptic number.

20804923737 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20804923737 is a deficient number, since it is larger than the sum of its proper divisors (12388117543).

20804923737 is a wasteful number, since it uses less digits than its factorization.

20804923737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59273309 (or 59273303 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20804923737 in words is "twenty billion, eight hundred four million, nine hundred twenty-three thousand, seven hundred thirty-seven".