20454542 has 4 divisors (see below), whose sum is σ = 30681816. Its totient is φ = 10227270.

The previous prime is 20454529. The next prime is 20454547. The reversal of 20454542 is 24545402.

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 (20454547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5113634 + ... + 5113637.

It is an arithmetic number, because the mean of its divisors is an integer number (7670454).

Almost surely, 2^20454542 is an apocalyptic number.

20454542 is a deficient number, since it is larger than the sum of its proper divisors (10227274).

20454542 is a wasteful number, since it uses less digits than its factorization.

20454542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10227273.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 20454542 is about 4522.6697867521. The cubic root of 20454542 is about 273.4827384004.

Adding to 20454542 its reverse (24545402), we get a palindrome (44999944).

The spelling of 20454542 in words is "twenty million, four hundred fifty-four thousand, five hundred forty-two".