20518893 has 8 divisors (see below), whose sum is σ = 30398400. Its totient is φ = 13679244.

The previous prime is 20518891. The next prime is 20518903. The reversal of 20518893 is 39881502.

It is not a de Polignac number, because 20518893 - 2¹ = 20518891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518891) 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, 379953 + ... + 380006.

It is an arithmetic number, because the mean of its divisors is an integer number (3799800).

Almost surely, 2^20518893 is an apocalyptic number.

It is an amenable number.

20518893 is a deficient number, since it is larger than the sum of its proper divisors (9879507).

20518893 is an equidigital number, since it uses as much as digits as its factorization.

20518893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759968 (or 759962 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20518893 is about 4529.7784714045. The cubic root of 20518893 is about 273.7692349029.

The spelling of 20518893 in words is "twenty million, five hundred eighteen thousand, eight hundred ninety-three".