20328401 has 4 divisors (see below), whose sum is σ = 20556900. Its totient is φ = 20099904.

The previous prime is 20328367. The next prime is 20328419. The reversal of 20328401 is 10482302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11566801 + 8761600 = 3401^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 20328401 - 2⁶ = 20328337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20328421) 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, 114116 + ... + 114293.

It is an arithmetic number, because the mean of its divisors is an integer number (5139225).

Almost surely, 2^20328401 is an apocalyptic number.

It is an amenable number.

20328401 is a deficient number, since it is larger than the sum of its proper divisors (228499).

20328401 is an equidigital number, since it uses as much as digits as its factorization.

20328401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228498.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20328401 is about 4508.7028067949. The cubic root of 20328401 is about 272.9193990701.

The spelling of 20328401 in words is "twenty million, three hundred twenty-eight thousand, four hundred one".