20859915919 has 4 divisors (see below), whose sum is σ = 20860338240. Its totient is φ = 20859493600.

The previous prime is 20859915893. The next prime is 20859915991. The reversal of 20859915919 is 91951995802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91951995802 = 2 ⋅45975997901.

It is a cyclic number.

It is not a de Polignac number, because 20859915919 - 2²³ = 20851527311 is a prime.

It is a super-2 number, since 2×20859915919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20859915119) 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, 125482 + ... + 239719.

It is an arithmetic number, because the mean of its divisors is an integer number (5215084560).

Almost surely, 2^20859915919 is an apocalyptic number.

20859915919 is a deficient number, since it is larger than the sum of its proper divisors (422321).

20859915919 is an equidigital number, since it uses as much as digits as its factorization.

20859915919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422320.

The product of its (nonzero) digits is 2624400, while the sum is 58.

The spelling of 20859915919 in words is "twenty billion, eight hundred fifty-nine million, nine hundred fifteen thousand, nine hundred nineteen".