20858006357 has 2 divisors, whose sum is σ = 20858006358. Its totient is φ = 20858006356.

The previous prime is 20858006347. The next prime is 20858006359. The reversal of 20858006357 is 75360085802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15493029841 + 5364976516 = 124471^2 + 73246^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858006357 - 2⁴ = 20858006341 is a prime.

It is a super-2 number, since 2×20858006357² (a number of 21 digits) contains 22 as substring.

Together with 20858006359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20858006359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429003178 + 10429003179.

It is an arithmetic number, because the mean of its divisors is an integer number (10429003179).

Almost surely, 2^20858006357 is an apocalyptic number.

It is an amenable number.

20858006357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858006357 is an equidigital number, since it uses as much as digits as its factorization.

20858006357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 20858006357 in words is "twenty billion, eight hundred fifty-eight million, six thousand, three hundred fifty-seven".