20639870501 has 8 divisors (see below), whose sum is σ = 20668677120. Its totient is φ = 20611086912.

The previous prime is 20639870497. The next prime is 20639870509. The reversal of 20639870501 is 10507893602.

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

It is a cyclic number.

It is not a de Polignac number, because 20639870501 - 2² = 20639870497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639870509) 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 7 ways as a sum of consecutive naturals, for example, 2462045 + ... + 2470413.

It is an arithmetic number, because the mean of its divisors is an integer number (2583584640).

Almost surely, 2^20639870501 is an apocalyptic number.

It is an amenable number.

20639870501 is a deficient number, since it is larger than the sum of its proper divisors (28806619).

20639870501 is a wasteful number, since it uses less digits than its factorization.

20639870501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11515.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20639870501 in words is "twenty billion, six hundred thirty-nine million, eight hundred seventy thousand, five hundred one".