20682161501 has 4 divisors (see below), whose sum is σ = 20688351552. Its totient is φ = 20675971452.

The previous prime is 20682161491. The next prime is 20682161557. The reversal of 20682161501 is 10516128602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20682161501 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 (20682161701) 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 3 ways as a sum of consecutive naturals, for example, 3090011 + ... + 3096696.

It is an arithmetic number, because the mean of its divisors is an integer number (5172087888).

Almost surely, 2^20682161501 is an apocalyptic number.

It is an amenable number.

20682161501 is a deficient number, since it is larger than the sum of its proper divisors (6190051).

20682161501 is an equidigital number, since it uses as much as digits as its factorization.

20682161501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190050.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 20682161501 in words is "twenty billion, six hundred eighty-two million, one hundred sixty-one thousand, five hundred one".