20345984 has 32 divisors (see below), whose sum is σ = 42301440. Its totient is φ = 9729280.

The previous prime is 20345953. The next prime is 20345987. The reversal of 20345984 is 48954302.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20345987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512 + ... + 6399.

It is an arithmetic number, because the mean of its divisors is an integer number (1321920).

Almost surely, 2^20345984 is an apocalyptic number.

It is an amenable number.

20345984 is an abundant number, since it is smaller than the sum of its proper divisors (21955456).

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

20345984 is an equidigital number, since it uses as much as digits as its factorization.

20345984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948 (or 6936 counting only the distinct ones).

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

The square root of 20345984 is about 4510.6522809900. The cubic root of 20345984 is about 272.9980633799.

The spelling of 20345984 in words is "twenty million, three hundred forty-five thousand, nine hundred eighty-four".