20206454 has 4 divisors (see below), whose sum is σ = 30309684. Its totient is φ = 10103226.

The previous prime is 20206453. The next prime is 20206493. The reversal of 20206454 is 45460202.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206453) 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 as a sum of consecutive naturals, namely, 5051612 + ... + 5051615.

It is an arithmetic number, because the mean of its divisors is an integer number (7577421).

Almost surely, 2^20206454 is an apocalyptic number.

20206454 is a deficient number, since it is larger than the sum of its proper divisors (10103230).

20206454 is a wasteful number, since it uses less digits than its factorization.

20206454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10103229.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20206454 is about 4495.1589515834. The cubic root of 20206454 is about 272.3725701078.

Adding to 20206454 its reverse (45460202), we get a palindrome (65666656).

It can be divided in two parts, 202064 and 54, that multiplied together give a triangular number (10911456 = T₄₆₇₁).

The spelling of 20206454 in words is "twenty million, two hundred six thousand, four hundred fifty-four".