20436454 has 4 divisors (see below), whose sum is σ = 30654684. Its totient is φ = 10218226.

The previous prime is 20436433. The next prime is 20436461. The reversal of 20436454 is 45463402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109112 + ... + 5109115.

It is an arithmetic number, because the mean of its divisors is an integer number (7663671).

Almost surely, 2^20436454 is an apocalyptic number.

20436454 is a deficient number, since it is larger than the sum of its proper divisors (10218230).

20436454 is a wasteful number, since it uses less digits than its factorization.

20436454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218229.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 20436454 is about 4520.6696406617. The cubic root of 20436454 is about 273.4021008150.

Adding to 20436454 its reverse (45463402), we get a palindrome (65899856).

The spelling of 20436454 in words is "twenty million, four hundred thirty-six thousand, four hundred fifty-four".