20428153 has 4 divisors (see below), whose sum is σ = 20474100. Its totient is φ = 20382208.

The previous prime is 20428141. The next prime is 20428157. The reversal of 20428153 is 35182402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7661824 + 12766329 = 2768^2 + 3573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20428153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20428157) 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, 22300 + ... + 23197.

It is an arithmetic number, because the mean of its divisors is an integer number (5118525).

Almost surely, 2^20428153 is an apocalyptic number.

It is an amenable number.

20428153 is a deficient number, since it is larger than the sum of its proper divisors (45947).

20428153 is an equidigital number, since it uses as much as digits as its factorization.

20428153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45946.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20428153 is about 4519.7514312183. The cubic root of 20428153 is about 273.3650784400.

The spelling of 20428153 in words is "twenty million, four hundred twenty-eight thousand, one hundred fifty-three".