20664741737 has 4 divisors (see below), whose sum is σ = 20666284500. Its totient is φ = 20663198976.

The previous prime is 20664741733. The next prime is 20664741749. The reversal of 20664741737 is 73714746602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4548693136 + 16116048601 = 67444^2 + 126949^2 .

It is a cyclic number.

It is not a de Polignac number, because 20664741737 - 2² = 20664741733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20664741691 and 20664741700.

It is not an unprimeable number, because it can be changed into a prime (20664741733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751112 + ... + 778137.

It is an arithmetic number, because the mean of its divisors is an integer number (5166571125).

Almost surely, 2^20664741737 is an apocalyptic number.

It is an amenable number.

20664741737 is a deficient number, since it is larger than the sum of its proper divisors (1542763).

20664741737 is a wasteful number, since it uses less digits than its factorization.

20664741737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542762.

The product of its (nonzero) digits is 1185408, while the sum is 47.

The spelling of 20664741737 in words is "twenty billion, six hundred sixty-four million, seven hundred forty-one thousand, seven hundred thirty-seven".