20858006129 has 4 divisors (see below), whose sum is σ = 22084947684. Its totient is φ = 19631064576.

The previous prime is 20858006123. The next prime is 20858006131. The reversal of 20858006129 is 92160085802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19245180529 + 1612825600 = 138727^2 + 40160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858006129 - 2²⁴ = 20841228913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20858006123) 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, 613470752 + ... + 613470785.

It is an arithmetic number, because the mean of its divisors is an integer number (5521236921).

Almost surely, 2^20858006129 is an apocalyptic number.

It is an amenable number.

20858006129 is a deficient number, since it is larger than the sum of its proper divisors (1226941555).

20858006129 is a wasteful number, since it uses less digits than its factorization.

20858006129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226941554.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 20858006129 in words is "twenty billion, eight hundred fifty-eight million, six thousand, one hundred twenty-nine".