20864866558 has 8 divisors (see below), whose sum is σ = 31340351952. Its totient is φ = 10418082576.

The previous prime is 20864866543. The next prime is 20864866579. The reversal of 20864866558 is 85566846802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7173535 + ... + 7176442.

It is an arithmetic number, because the mean of its divisors is an integer number (3917543994).

Almost surely, 2^20864866558 is an apocalyptic number.

20864866558 is a deficient number, since it is larger than the sum of its proper divisors (10475485394).

20864866558 is a wasteful number, since it uses less digits than its factorization.

20864866558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14350706.

The product of its (nonzero) digits is 22118400, while the sum is 58.

The spelling of 20864866558 in words is "twenty billion, eight hundred sixty-four million, eight hundred sixty-six thousand, five hundred fifty-eight".