20868356458 has 16 divisors (see below), whose sum is σ = 33546314880. Its totient is φ = 9710773776.

The previous prime is 20868356449. The next prime is 20868356497. The reversal of 20868356458 is 85465386802.

It is a junction number, because it is equal to n+sod(n) for n = 20868356399 and 20868356408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6128838 + ... + 6132241.

It is an arithmetic number, because the mean of its divisors is an integer number (2096644680).

Almost surely, 2^20868356458 is an apocalyptic number.

20868356458 is a deficient number, since it is larger than the sum of its proper divisors (12677958422).

20868356458 is a wasteful number, since it uses less digits than its factorization.

20868356458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12261141.

The product of its (nonzero) digits is 11059200, while the sum is 55.

The spelling of 20868356458 in words is "twenty billion, eight hundred sixty-eight million, three hundred fifty-six thousand, four hundred fifty-eight".