20321459 has 4 divisors (see below), whose sum is σ = 20549880. Its totient is φ = 20093040.

The previous prime is 20321447. The next prime is 20321537. The reversal of 20321459 is 95412302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95412302 = 2 ⋅47706151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321159) 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, 114077 + ... + 114254.

It is an arithmetic number, because the mean of its divisors is an integer number (5137470).

Almost surely, 2^20321459 is an apocalyptic number.

20321459 is a deficient number, since it is larger than the sum of its proper divisors (228421).

20321459 is an equidigital number, since it uses as much as digits as its factorization.

20321459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228420.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20321459 is about 4507.9328965724. The cubic root of 20321459 is about 272.8883288747. Note that the first 3 decimals are identical.

The spelling of 20321459 in words is "twenty million, three hundred twenty-one thousand, four hundred fifty-nine".