20340923851 has 2 divisors, whose sum is σ = 20340923852. Its totient is φ = 20340923850.

The previous prime is 20340923833. The next prime is 20340923887. The reversal of 20340923851 is 15832904302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20340923851 - 2³³ = 11750989259 is a prime.

It is a super-2 number, since 2×20340923851² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20340923851.

It is not a weakly prime, because it can be changed into another prime (20340923821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170461925 + 10170461926.

It is an arithmetic number, because the mean of its divisors is an integer number (10170461926).

Almost surely, 2^20340923851 is an apocalyptic number.

20340923851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340923851 is an equidigital number, since it uses as much as digits as its factorization.

20340923851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20340923851 in words is "twenty billion, three hundred forty million, nine hundred twenty-three thousand, eight hundred fifty-one".