20730786 has 48 divisors (see below), whose sum is σ = 46414944. Its totient is φ = 6150528.

The previous prime is 20730781. The next prime is 20730799. The reversal of 20730786 is 68703702.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20730781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36541 + ... + 37103.

It is an arithmetic number, because the mean of its divisors is an integer number (966978).

Almost surely, 2^20730786 is an apocalyptic number.

20730786 is an abundant number, since it is smaller than the sum of its proper divisors (25684158).

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

20730786 is a wasteful number, since it uses less digits than its factorization.

20730786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20730786 is about 4553.1072906313. The cubic root of 20730786 is about 274.7083895076.

The spelling of 20730786 in words is "twenty million, seven hundred thirty thousand, seven hundred eighty-six".