20859407999 has 16 divisors (see below), whose sum is σ = 22313944320. Its totient is φ = 19456174080.

The previous prime is 20859407993. The next prime is 20859408029. The reversal of 20859407999 is 99970495802.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20859407999 is a prime.

It is a super-2 number, since 2×20859407999² (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 (20859407993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498617 + ... + 538829.

It is an arithmetic number, because the mean of its divisors is an integer number (1394621520).

Almost surely, 2^20859407999 is an apocalyptic number.

20859407999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20859407999 is a deficient number, since it is larger than the sum of its proper divisors (1454536321).

20859407999 is a wasteful number, since it uses less digits than its factorization.

20859407999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40850.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 20859407999 in words is "twenty billion, eight hundred fifty-nine million, four hundred seven thousand, nine hundred ninety-nine".