20662105129 has 4 divisors (see below), whose sum is σ = 20669511040. Its totient is φ = 20654699220.

The previous prime is 20662105117. The next prime is 20662105147. The reversal of 20662105129 is 92150126602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20662105129 - 2⁷ = 20662105001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20662105094 and 20662105103.

It is not an unprimeable number, because it can be changed into a prime (20662105109) 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, 3698769 + ... + 3704350.

It is an arithmetic number, because the mean of its divisors is an integer number (5167377760).

Almost surely, 2^20662105129 is an apocalyptic number.

It is an amenable number.

20662105129 is a deficient number, since it is larger than the sum of its proper divisors (7405911).

20662105129 is an equidigital number, since it uses as much as digits as its factorization.

20662105129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7405910.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 20662105129 in words is "twenty billion, six hundred sixty-two million, one hundred five thousand, one hundred twenty-nine".