20442554 has 8 divisors (see below), whose sum is σ = 33451488. Its totient is φ = 9292060.

The previous prime is 20442523. The next prime is 20442557. The reversal of 20442554 is 45524402.

20442554 = 660² + 661² + ... + 703².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20442557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464582 + ... + 464625.

It is an arithmetic number, because the mean of its divisors is an integer number (4181436).

Almost surely, 2^20442554 is an apocalyptic number.

20442554 is a deficient number, since it is larger than the sum of its proper divisors (13008934).

20442554 is a wasteful number, since it uses less digits than its factorization.

20442554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929220.

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

The square root of 20442554 is about 4521.3442691306. The cubic root of 20442554 is about 273.4293003626.

Adding to 20442554 its reverse (45524402), we get a palindrome (65966956).

The spelling of 20442554 in words is "twenty million, four hundred forty-two thousand, five hundred fifty-four".