20259018 has 32 divisors (see below), whose sum is σ = 48484800. Its totient is φ = 6233328.

The previous prime is 20259011. The next prime is 20259049. The reversal of 20259018 is 81095202.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20258982 and 20259000.

It is not an unprimeable number, because it can be changed into a prime (20259011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13728 + ... + 15131.

It is an arithmetic number, because the mean of its divisors is an integer number (1515150).

Almost surely, 2^20259018 is an apocalyptic number.

20259018 is an abundant number, since it is smaller than the sum of its proper divisors (28225782).

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

20259018 is a wasteful number, since it uses less digits than its factorization.

20259018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28883 (or 28877 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 20259018 is about 4501.0018884688. The cubic root of 20259018 is about 272.6085441386.

The spelling of 20259018 in words is "twenty million, two hundred fifty-nine thousand, eighteen".