20455143 has 8 divisors (see below), whose sum is σ = 27907968. Its totient is φ = 13319544.

The previous prime is 20455139. The next prime is 20455157. The reversal of 20455143 is 34155402.

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

It is not a de Polignac number, because 20455143 - 2² = 20455139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79155 + ... + 79412.

It is an arithmetic number, because the mean of its divisors is an integer number (3488496).

Almost surely, 2^20455143 is an apocalyptic number.

20455143 is a deficient number, since it is larger than the sum of its proper divisors (7452825).

20455143 is a wasteful number, since it uses less digits than its factorization.

20455143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158613.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20455143 is about 4522.7362293196. The cubic root of 20455143 is about 273.4854168848.

The spelling of 20455143 in words is "twenty million, four hundred fifty-five thousand, one hundred forty-three".