20858493 has 8 divisors (see below), whose sum is σ = 29020608. Its totient is φ = 13301024.

The previous prime is 20858489. The next prime is 20858503. The reversal of 20858493 is 39485802.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20858493 - 2² = 20858489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151080 + ... + 151217.

It is an arithmetic number, because the mean of its divisors is an integer number (3627576).

Almost surely, 2^20858493 is an apocalyptic number.

20858493 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20858493 is a deficient number, since it is larger than the sum of its proper divisors (8162115).

20858493 is a wasteful number, since it uses less digits than its factorization.

20858493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302323.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20858493 is about 4567.1099176613. The cubic root of 20858493 is about 275.2713266999.

The spelling of 20858493 in words is "twenty million, eight hundred fifty-eight thousand, four hundred ninety-three".