20958858069 has 4 divisors (see below), whose sum is σ = 27945144096. Its totient is φ = 13972572044.

The previous prime is 20958858049. The next prime is 20958858083. The reversal of 20958858069 is 96085885902.

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 20958858069 - 2¹² = 20958853973 is a prime.

It is a super-2 number, since 2×20958858069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958858049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3493143009 + ... + 3493143014.

It is an arithmetic number, because the mean of its divisors is an integer number (6986286024).

Almost surely, 2^20958858069 is an apocalyptic number.

It is an amenable number.

20958858069 is a deficient number, since it is larger than the sum of its proper divisors (6986286027).

20958858069 is an equidigital number, since it uses as much as digits as its factorization.

20958858069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986286026.

The product of its (nonzero) digits is 12441600, while the sum is 60.

The spelling of 20958858069 in words is "twenty billion, nine hundred fifty-eight million, eight hundred fifty-eight thousand, sixty-nine".