20864858 has 8 divisors (see below), whose sum is σ = 35768352. Its totient is φ = 8942076.

The previous prime is 20864849. The next prime is 20864863. The reversal of 20864858 is 85846802.

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

It is a Curzon 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, 745160 + ... + 745187.

It is an arithmetic number, because the mean of its divisors is an integer number (4471044).

Almost surely, 2^20864858 is an apocalyptic number.

20864858 is a deficient number, since it is larger than the sum of its proper divisors (14903494).

20864858 is a wasteful number, since it uses less digits than its factorization.

20864858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490356.

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 20864858 is about 4567.8066946840. The cubic root of 20864858 is about 275.2993236698.

The spelling of 20864858 in words is "twenty million, eight hundred sixty-four thousand, eight hundred fifty-eight".