20940259 has 4 divisors (see below), whose sum is σ = 20994480. Its totient is φ = 20886040.

The previous prime is 20940253. The next prime is 20940289. The reversal of 20940259 is 95204902.

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

It is a cyclic number.

It is not a de Polignac number, because 20940259 - 2³ = 20940251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20940259.

It is not an unprimeable number, because it can be changed into a prime (20940251) 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, 26527 + ... + 27304.

It is an arithmetic number, because the mean of its divisors is an integer number (5248620).

Almost surely, 2^20940259 is an apocalyptic number.

20940259 is a deficient number, since it is larger than the sum of its proper divisors (54221).

20940259 is an equidigital number, since it uses as much as digits as its factorization.

20940259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54220.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20940259 is about 4576.0527750453. The cubic root of 20940259 is about 275.6305486994.

The spelling of 20940259 in words is "twenty million, nine hundred forty thousand, two hundred fifty-nine".