20493785 has 24 divisors (see below), whose sum is σ = 27054720. Its totient is φ = 14893632.

The previous prime is 20493773. The next prime is 20493791. The reversal of 20493785 is 58739402.

It is not a de Polignac number, because 20493785 - 2¹⁰ = 20492761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66602 + ... + 66908.

It is an arithmetic number, because the mean of its divisors is an integer number (1127280).

Almost surely, 2^20493785 is an apocalyptic number.

It is an amenable number.

20493785 is a deficient number, since it is larger than the sum of its proper divisors (6560935).

20493785 is a wasteful number, since it uses less digits than its factorization.

20493785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20493785 is about 4527.0061851073. The cubic root of 20493785 is about 273.6575231653.

The spelling of 20493785 in words is "twenty million, four hundred ninety-three thousand, seven hundred eighty-five".