20870459 has 4 divisors (see below), whose sum is σ = 21590160. Its totient is φ = 20150760.

The previous prime is 20870449. The next prime is 20870467. The reversal of 20870459 is 95407802.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20870459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20870429) 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, 359807 + ... + 359864.

It is an arithmetic number, because the mean of its divisors is an integer number (5397540).

Almost surely, 2^20870459 is an apocalyptic number.

20870459 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20870459 is a deficient number, since it is larger than the sum of its proper divisors (719701).

20870459 is an equidigital number, since it uses as much as digits as its factorization.

20870459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719700.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20870459 is about 4568.4197486658. The cubic root of 20870459 is about 275.3239554144.

The spelling of 20870459 in words is "twenty million, eight hundred seventy thousand, four hundred fifty-nine".