20639398753 has 8 divisors (see below), whose sum is σ = 20756396160. Its totient is φ = 20522702160.

The previous prime is 20639398727. The next prime is 20639398757. The reversal of 20639398753 is 35789393602.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20639398753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20639398694 and 20639398703.

It is not an unprimeable number, because it can be changed into a prime (20639398757) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 63126 + ... + 212752.

It is an arithmetic number, because the mean of its divisors is an integer number (2594549520).

Almost surely, 2^20639398753 is an apocalyptic number.

It is an amenable number.

20639398753 is a deficient number, since it is larger than the sum of its proper divisors (116997407).

20639398753 is a wasteful number, since it uses less digits than its factorization.

20639398753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150407.

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 20639398753 in words is "twenty billion, six hundred thirty-nine million, three hundred ninety-eight thousand, seven hundred fifty-three".