20655745 has 8 divisors (see below), whose sum is σ = 27040320. Its totient is φ = 15022320.

The previous prime is 20655737. The next prime is 20655749. The reversal of 20655745 is 54755602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20655745 - 2³ = 20655737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20655745.

It is not an unprimeable number, because it can be changed into a prime (20655749) 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, 187725 + ... + 187834.

It is an arithmetic number, because the mean of its divisors is an integer number (3380040).

Almost surely, 2^20655745 is an apocalyptic number.

It is an amenable number.

20655745 is a deficient number, since it is larger than the sum of its proper divisors (6384575).

20655745 is a wasteful number, since it uses less digits than its factorization.

20655745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375575.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 20655745 is about 4544.8591837372. The cubic root of 20655745 is about 274.3765269398.

It can be divided in two parts, 206557 and 45, that added together give a palindrome (206602).

The spelling of 20655745 in words is "twenty million, six hundred fifty-five thousand, seven hundred forty-five".