20730745 has 8 divisors (see below), whose sum is σ = 28430784. Its totient is φ = 14215344.

The previous prime is 20730739. The next prime is 20730757. The reversal of 20730745 is 54703702.

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 20730745 - 2⁹ = 20730233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296119 + ... + 296188.

It is an arithmetic number, because the mean of its divisors is an integer number (3553848).

Almost surely, 2^20730745 is an apocalyptic number.

It is an amenable number.

20730745 is a deficient number, since it is larger than the sum of its proper divisors (7700039).

20730745 is an equidigital number, since it uses as much as digits as its factorization.

20730745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592319.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20730745 is about 4553.1027882094. The cubic root of 20730745 is about 274.7082084074.

The spelling of 20730745 in words is "twenty million, seven hundred thirty thousand, seven hundred forty-five".