20716423381 has 4 divisors (see below), whose sum is σ = 21008204064. Its totient is φ = 20424642700.

The previous prime is 20716423373. The next prime is 20716423393. The reversal of 20716423381 is 18332461702.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18332461702 = 2 ⋅9166230851.

It is a cyclic number.

It is not a de Polignac number, because 20716423381 - 2³ = 20716423373 is a prime.

It is a super-2 number, since 2×20716423381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20716423381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716423781) 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, 145890235 + ... + 145890376.

It is an arithmetic number, because the mean of its divisors is an integer number (5252051016).

Almost surely, 2^20716423381 is an apocalyptic number.

It is an amenable number.

20716423381 is a deficient number, since it is larger than the sum of its proper divisors (291780683).

20716423381 is an equidigital number, since it uses as much as digits as its factorization.

20716423381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291780682.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 20716423381 in words is "twenty billion, seven hundred sixteen million, four hundred twenty-three thousand, three hundred eighty-one".