20859497 has 8 divisors (see below), whose sum is σ = 22275840. Its totient is φ = 19489680.

The previous prime is 20859479. The next prime is 20859521. The reversal of 20859497 is 79495802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20859497 - 2²² = 16665193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20859427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10703 + ... + 12500.

It is an arithmetic number, because the mean of its divisors is an integer number (2784480).

Almost surely, 2^20859497 is an apocalyptic number.

It is an amenable number.

20859497 is a deficient number, since it is larger than the sum of its proper divisors (1416343).

20859497 is a wasteful number, since it uses less digits than its factorization.

20859497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23263.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20859497 is about 4567.2198326772. The cubic root of 20859497 is about 275.2757432538.

The spelling of 20859497 in words is "twenty million, eight hundred fifty-nine thousand, four hundred ninety-seven".