20455331 has 4 divisors (see below), whose sum is σ = 22028832. Its totient is φ = 18881832.

The previous prime is 20455327. The next prime is 20455361. The reversal of 20455331 is 13355402.

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 20455331 - 2² = 20455327 is a prime.

It is a super-2 number, since 2×20455331² = 836841132639122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20455297 and 20455306.

It is not an unprimeable number, because it can be changed into a prime (20455321) 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, 786731 + ... + 786756.

It is an arithmetic number, because the mean of its divisors is an integer number (5507208).

Almost surely, 2^20455331 is an apocalyptic number.

20455331 is a deficient number, since it is larger than the sum of its proper divisors (1573501).

20455331 is a wasteful number, since it uses less digits than its factorization.

20455331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573500.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20455331 is about 4522.7570131503. The cubic root of 20455331 is about 273.4862547360.

The spelling of 20455331 in words is "twenty million, four hundred fifty-five thousand, three hundred thirty-one".