20443454 has 4 divisors (see below), whose sum is σ = 30665184. Its totient is φ = 10221726.

The previous prime is 20443453. The next prime is 20443457. The reversal of 20443454 is 45434402.

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

It is a super-2 number, since 2×20443454² = 835869622900232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110862 + ... + 5110865.

It is an arithmetic number, because the mean of its divisors is an integer number (7666296).

Almost surely, 2^20443454 is an apocalyptic number.

20443454 is a deficient number, since it is larger than the sum of its proper divisors (10221730).

20443454 is a wasteful number, since it uses less digits than its factorization.

20443454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221729.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 20443454 is about 4521.4437959572. The cubic root of 20443454 is about 273.4333129525.

Adding to 20443454 its reverse (45434402), we get a palindrome (65877856).

The spelling of 20443454 in words is "twenty million, four hundred forty-three thousand, four hundred fifty-four".