20805258 has 8 divisors (see below), whose sum is σ = 41610528. Its totient is φ = 6935084.

The previous prime is 20805223. The next prime is 20805259. The reversal of 20805258 is 85250802.

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

20805258 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20805259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733766 + ... + 1733777.

It is an arithmetic number, because the mean of its divisors is an integer number (5201316).

Almost surely, 2^20805258 is an apocalyptic number.

20805258 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20805258 is a wasteful number, since it uses less digits than its factorization.

20805258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467548.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 20805258 is about 4561.2781103546. The cubic root of 20805258 is about 275.0369448987.

The spelling of 20805258 in words is "twenty million, eight hundred five thousand, two hundred fifty-eight".