20730018 has 16 divisors (see below), whose sum is σ = 41764320. Its totient is φ = 6859296.

The previous prime is 20730011. The next prime is 20730037. The reversal of 20730018 is 81003702.

It is a junction number, because it is equal to n+sod(n) for n = 20729976 and 20730003.

It is not an unprimeable number, because it can be changed into a prime (20730011) 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, 11788 + ... + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (2610270).

Almost surely, 2^20730018 is an apocalyptic number.

20730018 is an abundant number, since it is smaller than the sum of its proper divisors (21034302).

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

20730018 is a wasteful number, since it uses less digits than its factorization.

20730018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25361.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 20730018 is about 4553.0229518420. The cubic root of 20730018 is about 274.7049971511.

The spelling of 20730018 in words is "twenty million, seven hundred thirty thousand, eighteen".