20153559 has 4 divisors (see below), whose sum is σ = 26871416. Its totient is φ = 13435704.

The previous prime is 20153531. The next prime is 20153561. The reversal of 20153559 is 95535102.

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

It is not a de Polignac number, because 20153559 - 2⁹ = 20153047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153569) 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 3 ways as a sum of consecutive naturals, for example, 3358924 + ... + 3358929.

It is an arithmetic number, because the mean of its divisors is an integer number (6717854).

Almost surely, 2^20153559 is an apocalyptic number.

20153559 is a deficient number, since it is larger than the sum of its proper divisors (6717857).

20153559 is an equidigital number, since it uses as much as digits as its factorization.

20153559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717856.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 20153559 is about 4489.2715444713. The cubic root of 20153559 is about 272.1346966583.

The spelling of 20153559 in words is "twenty million, one hundred fifty-three thousand, five hundred fifty-nine".