20500006501 has 8 divisors (see below), whose sum is σ = 22078095704. Its totient is φ = 18922083840.

The previous prime is 20500006459. The next prime is 20500006517. The reversal of 20500006501 is 10560000502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 72165025 + 20427841476 = 8495^2 + 142926^2 .

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 20500006501 - 2²¹ = 20497909349 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 (20500004501) 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, 351721 + ... + 405841.

It is an arithmetic number, because the mean of its divisors is an integer number (2759761963).

Almost surely, 2^20500006501 is an apocalyptic number.

It is an amenable number.

20500006501 is a deficient number, since it is larger than the sum of its proper divisors (1578089203).

20500006501 is a wasteful number, since it uses less digits than its factorization.

20500006501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83271.

The product of its (nonzero) digits is 300, while the sum is 19.

The spelling of 20500006501 in words is "twenty billion, five hundred million, six thousand, five hundred one".