20682323157 has 4 divisors (see below), whose sum is σ = 27576430880. Its totient is φ = 13788215436.

The previous prime is 20682323149. The next prime is 20682323171. The reversal of 20682323157 is 75132328602.

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 not a de Polignac number, because 20682323157 - 2³ = 20682323149 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 (20682123157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3447053857 + ... + 3447053862.

It is an arithmetic number, because the mean of its divisors is an integer number (6894107720).

Almost surely, 2^20682323157 is an apocalyptic number.

It is an amenable number.

20682323157 is a deficient number, since it is larger than the sum of its proper divisors (6894107723).

20682323157 is an equidigital number, since it uses as much as digits as its factorization.

20682323157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894107722.

The product of its (nonzero) digits is 120960, while the sum is 39.

Subtracting 20682323157 from its reverse (75132328602), we obtain a palindrome (54450005445).

The spelling of 20682323157 in words is "twenty billion, six hundred eighty-two million, three hundred twenty-three thousand, one hundred fifty-seven".