20384945 has 8 divisors (see below), whose sum is σ = 27956544. Its totient is φ = 13978224.

The previous prime is 20384933. The next prime is 20384953. The reversal of 20384945 is 54948302.

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 20384945 - 2²⁴ = 3607729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 582427 = 20384945 / (2 + 0 + 3 + 8 + 4 + 9 + 4 + 5).

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, 291179 + ... + 291248.

It is an arithmetic number, because the mean of its divisors is an integer number (3494568).

Almost surely, 2^20384945 is an apocalyptic number.

It is an amenable number.

20384945 is a deficient number, since it is larger than the sum of its proper divisors (7571599).

20384945 is an equidigital number, since it uses as much as digits as its factorization.

20384945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582439.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20384945 is about 4514.9689921416. The cubic root of 20384945 is about 273.1722090580.

The spelling of 20384945 in words is "twenty million, three hundred eighty-four thousand, nine hundred forty-five".