20205251501 has 8 divisors (see below), whose sum is σ = 20256256440. Its totient is φ = 20154312448.

The previous prime is 20205251489. The next prime is 20205251503. The reversal of 20205251501 is 10515250202.

It can be written as a sum of positive squares in 4 ways, for example, as 12127735876 + 8077515625 = 110126^2 + 89875^2 .

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 20205251501 - 2¹⁴ = 20205235117 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 (20205251503) 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, 629105 + ... + 660441.

It is an arithmetic number, because the mean of its divisors is an integer number (2532032055).

Almost surely, 2^20205251501 is an apocalyptic number.

It is an amenable number.

20205251501 is a deficient number, since it is larger than the sum of its proper divisors (51004939).

20205251501 is an equidigital number, since it uses as much as digits as its factorization.

20205251501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32943.

The product of its (nonzero) digits is 1000, while the sum is 23.

The spelling of 20205251501 in words is "twenty billion, two hundred five million, two hundred fifty-one thousand, five hundred one".